Final Networks Exam
What is the typical length of a single run of an Ethernet communication over a twisted pair cable before repeating through a switch or router? 150m 200m 50m 100m
100m
Given the signal power = 150uW and noise power level = 10uW, calculate SNRdB. 15 dB 117dB -11dB 11dB 10dB
11dB
How many non-overlapping channels are there in 802.11a? - 3 - 8 - 4 - 12
12
What is the unique IP address of "localhost", i.e., your local computer?
127.0.0.1
The 902MHz to 928 MHz band is a license-free ISM (Industrial Scientific and Medical) band. Devices certified by the FCC in this band can operate license-free anywhere in the U.S. What is the wavelength in inches of a signal operating at 902 MHz? 1.309 0.1309 13.09 1309
13.09
Given a channel's bandwidth = 20 MHz, signal level at the receiving end = 15 mWatts and noise level at the receiving end = 500 µWatts, calculate SNRdB. -14 14 12 -12
14
Unlicensed radio transmitters must first be tested and approved for operation under FCC Part ___ rules.
15
What is the normal fragment size for an Ethernet LAN? 500 bytes 1500 bytes 2500 bytes 1000 bytes
1500 bytes
What is the data rate and STM number of OC-3? - 466.560 Mbps, STM-1 - 155.520 Mbps, STM-1 - 155.520 Mbps, STM-6 - 155.520 Mbps, STM-3
155.520 Mbps, STM-1
How long will it take to download a 10 MB song over a 500Kbps line? 0.16 s 160 s 16 s 1600 s
160s
Which of the following modulation schemes supports error-free transmission with the weakest receiver signal ? - BPSK - 256QAM - 64QAM - QPSK - 16QAM
256QAM
DS-3 lines transports __ DS-1 data streams
28
How many types of addresses are typically defined by the Link Layer protocols? 2 1 4 3
3
How many ways RF signal propagate? 1 3 2 4
3
How many ways to move light through a fiber optic cable? 3 1 2 4
3
The first ___ bytes of an Ethernet MAC address represent _______. 3 , the vendor's ID number 3 , the vendor's unique serial number for that card 2 , the vendor's unique serial number for that card 2 , the vendor's ID number
3, the vendor's ID number
How many ways can data flow happen?
3. Simplex, half-duplex, and full-duplex
Given the distance across the field = 1000 meters and the propagation speed = 3 x 10^8 m/sec, calculate the propagation time. Correct! 3.33 µs 3.33 s 333 s 3.33 ms
3.33 us
Which Coding Rate requires a better SNR at the receiver? - 1/2 - 3/4
3/4
Which of the following coding rates require the highest SNR for error-free transmission? - 2/3 - 3/4 - 1/3 - 1/2
3/4
Telephone voice channels used for dial-up modems typically has a frequency response of _____ - 300 - 3300 Hz - 600- 3000 Hz - 0 - 4000 Hz - 300 - 3300 KHz
300 - 3300 Hz
Dial-up modems are designed to keep all their signals in the _____ to _____ band. - 300, 3300 Hz - 300, 3300 KHz - 600, 3000 Hz - 0 - 4000 Hz
300, 3300 Hz
How many levels are needed for to get 5 bits/baud? 25 5 10 32
32
IPv4 addresses have ____ bits. - 32 - 4 - 128 - 64
32
A channel can pass 900 frames per minute. If the frame size is 2500 bits, what is the throughput of the channel? 375 bps 37.5 Kbps 3750 bps 2.25 Mbps
37.5 Kbps
Which part of the electromagnetic spectrum is useful for wireless communication? 3MHz to 900THz 3KHz to 900THz 3Hz to 900THz 3KHz to 900MHz
3KHz to 900THz
How much increment in the RX signal level is needed for error free decoding whenever the channel bandwidth is doubled? - 4 dB - 2 dB - No increament needed - 3dB - -3 dB
3dB
An IPv4 packet has arrived with the first few hexadecimal digits as shown below - (45000028000100000402 ... )HEX16 How many hops can this packet travel before being dropped? (Write the number only) [ IMAGE ]
4
How many bits are in each Unicode hexadecimal character FA01? 2 4 6 16
4
How many bytes are IPv4 addresses? 6 2 4 8
4
Infrared devices that comply with IrDa specifications allow on PCs and devices such as printers to communicate at raw data rates up to _____ 40 Mbps 4 Mbps 4000 Bps 4 MBps
4 Mbps
DS-3 Digital signals operate at: - 1.544 MBps - 672 Mbps - 44.736 Mbps - 1.544 Mbps
44.736 Mbps
What is the size of the data field in an Ethernet II frame? 46 - 1500 octets 2500 octets 40 octets 6 octets
46-1500 octets
A CRC code is defined as C (8,5). What is the number of data bits? 3 5 4 8
5
How many layers are there in the TCP/IP model? 2 7 5 4
5
Suppose we have a parity checker defined as C (6,5). What is the number of actual data bits? 3 4 5 6
5
log2(32) =? 5 2 6 4
5
What Capacity/Bandwidth Ratio is needed to get 50 Mbps on a 10 MHz wide RF channel regardless of the type of modulation used? (Fill in the number and label)
5 Mbps/MHz
Which of following layer(s) does not add a header to the message? (2) Network layer Application layer Physical layer Data link layer
Application layer, physical layer
In which area, a collision would be created if C starts to send to D? - Area between C and D - Area between A and D - Area between A and C - Area between A and B
Area between A and C
What is ATM? - Asynchronous Transmission Mode - Asynchronous Transfer Mode - Asynchronous Transfer Modulator - Asynchronous Transition Mode
Asynchronous Transfer Mode
According to the recent redefinition by FCC, what is the download and upload speed requirements of Broadband Wireless system? - At least 25 MBps, at least 3 MBps - At least 25 MBps, at least 3 Mbps - At least 25 Mbps, at least 3 Mbps - At least 25 Mbps, at least 3 MBps
At least 25 Mbps, at least 3 Mbps
What does ARQ stands for?(2) Automatic repeat query Automatic repeat request Automatic retransmission quarter Automatic retransmission queue
Automatic repeat query, and automatic repeat request
What can be increased for faster data throughput without increasing the occupied bandwidth of a broadband digital signal? Bit rate Signal strength Voltage level Baud rate
Baud rate
Which class of Ethernet cable(s) have has metal foil around each pair of conductors. Cat 7 Cat 6a Cat 6 Cat 5e Cat 5
Cat 6a
Which of the following cable(s) support(s) data rates of up to 1 Gbps? (2) CAT5 CAT5e CAT6 CAT3
Cat5e Cat 6
Which of the following type of noise can be present in twisted pair cable? Thermal noise Induced noise Impulse noises Crosstalk All answers are valid
Crosstalk
In case of periodic signals, one full iteration of a pattern is called a Frequency Cycle Wave Period
Cycle
Which of the following replaced coax cables used for early Ethernet LANs? (Note: There may be more than one answer.) (2) Electric cable Fiber optic cable Twisted pair cable Gold cable
Fiber optic cable, and twisted pair cable
What is a FSM? Frame State Machine Finite State Mechanism Frame State Modulation Finite State Machine
Finite State Machine
Which portion of the 7-digit number identified the central office in the old telephone system? - First 4 digits - Last 3 digits - Last 4 digits - First 3 digits
First 3 digits
Which of the followings are collectively known as Data Link Control? Flow and delivery control Error and congestion control Flow and congestion control Flow and error control
Flow and error control
Which of the following(s) is/are not provided by PPP?(2) Flow control Error control beyond detect and discard Link-establishment negotiation Data exchange Authentication
Flow control and error control beyond detect and discard
The way dish antenna achieve gain is by: Amplifying the signal. Focusing the signal at the back of the dish Focusing the signal at distant point at the other end of the link Focusing the signal at the feed element on the dish
Focusing the signal at the feed element on the dish
What are the two basic Block Coding Schemes?(2) Convolutional Coding Forward Error Correction (FEC) Viterbi algorithm Error Detection only
Forward Error Correction (FEC) Error Detection only
What does FDX mean? (A 2-word answer)
Full Duplex
In cable systems, the data network is a___________ (2) - Half Duplex, Point to Multipoint system - Full Duplex, Point to Point system - Half Duplex, Point to Point system - Full Duplex, Point to Multipoint system
Full Duplex, Point to Multipoint system
What protocol can be used to define how the client-server programs can be written to retrieve web pages from the Web? TCP SMTP HTTP POP
HTTP
What does HDX mean? (A 2-word answer)
Half Duplex
IEEE 802.11 WLANs are _____? - Time Division Duplex (TDD) - Half duplex - Simplex - Full duplex
Half duplex
Which of the followings are properties of TCP?(3) Handle datagram arrival only when the connection is alive Support 'full closure', even when one party does not want to close Verifies IP Header checksums at each hop Handles network datagram loss Sends data bi-directionally between two nodes Provides flow control to avoid data overload
Handles network datagram loss Sends data bi-directionally between two nodes. Provides flow control to avoid data overload.
At the sender, MIME transforms non-ASCII data to ____________. encrypted data NVT ASCII data Binary data non-ASCII data
NVT ASCII data
Which of the following has no security? - Narrow-Band - LoRaWAN - NB-LTE - LTE CAT 1 - LTE CAT M
Narrow-Band
Which technology has lowest TX data rate? [ CHART ] - LoRan - LTE-NB1 (NB-IoT) - NarrowBand (SigFox) - LTE Cat M1 - LTE Cat-1
NarrowBand (SigFox)
Which technology has the smallest RX bandwidth? [ CHART ] - LTE Cat-1 - LoRaWAN - LTE Cat M1 - LTE-NB1 (NB-IoT - NarrowBand (SigFox)
NarrowBand (SigFox)
Which layer is responsible for packet delivery from source to destination? Data link layer Network layer Transport layer Physical layer
Network Layer
What does NVT stand for? Network Virtual Terminal Network Virtual Transfer Network Video Transfer Network Video Terminal
Network Virtual Terminal
Which of the following can be a composition of a fiber optic cable? (From outermost layer to the innermost layer) PVC jacket, kevlar, cladding, plastic coating, core PVC jacket, kevlar, plastic coating, cladding, core Kevlar, Teflon jacket, plastic coating, cladding, core PVC jacket, plastic coating, cladding, kevlar, core
PVC jacket, kevlar, plastic coating, cladding, core
Which of the following prevents packet sniffing, packet modification and IP spooling respectively? Packet encryption, data integrity, origin authentication Packet encryption, origin authentication, data integrity Origin authentication, packet encryption, data integrity Data integrity, packet encryption, origin authentication
Packet encryption, data integrity, origin authentication
OSI stands for Open systems internet Open source internet Open systems interconnection Open standard interconnection
Open systems interconnection
In the 'Plain Old Telephone System', how is a telephone connected to the central office? - Fiber optic - Combination of fiber optics and Cat 3 cable - Coax cable - Outdoor UTP
Outdoor UTP
Which of the following(s) is/are true about horn antenna?(2) Received transmissions go straight up the stem. Outgoing transmissions go straight up the stem. Receives signal by the curved head Popular as dish antennas Receives signal from the far end
Outgoing transmissions go straight up the stem, receives signal by the curved head
Which of the following protocols are used for multicast routing? PIM TCP IGMP ICMP
PIM, IGMP
What email protocol is recommended if you want to run a portable email program and keep all your email on a USB stick?
POP
What security issues are applicable to the IP protocol?(3) Packet deletion Packet sniffing IP spooling Packet overflow Packet modification IP spoofing
Packet sniffing Packet modification IP Spoofing
Which of the following is not true for packet switched network? Packet switched network breaks data into packets More efficient than circuit switched networks Connecting devices store and forward packets Packets do not experience any delays
Packets do not experience delays
What can be done to if reliability is important and we are going to use IPv4? - Introducing CRC with IPv4 - Using Hamming Code in Datagrams - Pairing IPv4 with a reliable Transport Layer protocol such as TCP - Paring IPv4 with IPv6
Pairing IPv4 with a reliable Transport Layer protocol such as TCP
What is the shape of a grid dish antenna that provides gain to a radio signal? Rectangular Round Circular Parabolic Square
Parabolic
How long is a "word" in a IP Datagram Header? (2) - 4 bytes - 32 bits - 31 bits - 8 bytes - 20 bytes
- 4 bytes - 32 bits
Which of the followings are the auxiliary protocols for Network Layer in IPv4? (3) - ARP - ICMPv4 - IGMP - FTP - SCTP - TCP
- ARP - ICMPv4 - IGMP
Which of the following(s) are true about IPv4? (3) - Connectionless protocol - Reliable protocol - Uses datagram approach - IPv4 packets do not arrive out of order - IPv4 packets can be corrupted - IPv4 packets do not create congestion for the network
- Connectionless protocol - Uses datagram approach - IPv4 packets can be corrupted
Which of the followings are errors reported by ICMP to the source? (4) - Data limit exceeded - Destination unreachable - Time exceeded - Source died - Source quench - Redirection
- Destination unreachable - Time exceeded - Source quench - Redirection
Which of the following(s) is/are not Network Layer service(s)? (4) - Flow control - Quality of service - Congestion control - Error checking for the Datagram Header - Error control for the packet
- Flow control - Quality of service - Congestion control - Error control for the packet
Which of the following services in a router are unique to the Network Layer? (2) - Forwarding - Routing - Placing TCP/IP packets on the physical medium -Providing application layer with session and datagram services
- Forwarding - Routing
Which of the following are used by Bluetooth in the 2.4 GHz band? (3) - Frequency Hopping Spread Spectrum (FHSS) - Time Division Multiple Access (TDMA) - OFDM - Direct Sequence Spread Spectrum(DSSS) - Time Division Duplex (TDD)
- Frequency Hopping Spread Spectrum (FHSS) - Time Division Multiple Access (TDMA) - Time Division Duplex (TDD)
Which of the followings are parts of an IP datagram? (2) - Header - Parity Checker - Footer - Payload - FCS
- Header - Payload
Which of the following(s) are Network Layer protocol(s)? (3) - IP - SNMP - TCP & UDP - SCTP - IGMP - ARP - DHCP
- IP - IGMP - ARP
Which statements are true about datagram fragmentation? (5) - Link-Layer protocols will accept IP packets 576 bytes or larger but cannot fragment them further - Once fragmented, datagrams cannot be further fragmented - Each fragment is dependent on the original datagram before it was fragmented - Link-Layer protocols will accept IP packets 576 bytes or larger and then fragment them further if necessary - Done when the underlying network cannot transmit an entire datagram in one frame - Datagrams can be further fragmented down the line - Each fragment becomes its own, independent datagram - Datagrams are reassembled at intermediate routers if the network can handle the large frame - Once a datagram is fragmented, it stays fragmented until it reaches its final destination - IP will not fragment below 576 bytes since Link-Layer protocols will refuse accept IP packets smaller than that size
- Link-Layer protocols will accept IP packets 576 bytes or larger and then fragment them further if necessary - Done when the underlying network cannot transmit an entire datagram in one frame - Datagrams can be further fragmented down the line - Each fragment becomes its own, independent datagram - Once a datagram is fragmented, it stays fragmented until it reaches its final destination
What are the two types messages defined by ICMP? (2) - Response - Control - Query - Error reporting
- Query - Error reporting
What things are provided by the DHCP server?(4) - Subnet mask - Gateway IP address - Domain Name Server (DNS) address - Routing protocol - TTL (Time to Live) - Node IP address
- Subnet mask - Gateway IP address - Domain Name Server (DNS) address - Node IP address
What are the phases that the connections have in a connection oriented network?(3) - Handshaking - Tear down - Data transfer - Setup - Synchronization
- Tear down - Data transfer - Setup
Which of the followings can be a case where the router must discard a datagram? (4) - All fragments are not received within a predetermined time limit - All fragments are not received in order - There is an error in the packet header - Datagram header checksum received is not correct - Could not find a route to the destination - Time-to-live field is zero
- There is an error in the packet header - Datagram header checksum received is not correct - Could not find a route to the destination - Time-to-live field is zero
Routers support which layers of the TCP/IP model? (4) - Transport - Data Link - Switched WANs - Application - Network - Physical
- Transport - Data Link - Network - Physical
In a Virtual IP circuit ____(2) - all packets are guaranteed to arrive error-free at the destination - packets may arrive out of order at the destination - the path of the IP packets is known - packets will arrive in order at the destination
- the path of the IP packets is known - packets will arrive in order at the destination
Given x = 0.5, what is the value of log2(x)? 0.30 -1.0 1.0 0.25
-1.0
Which of the following is used for old telephone network? CAT4 CAT3 CAT1 CAT2
Cat 1
A receiver needs -70 dBm for 16 QAM for a 20 MHz channel. What is the receiver sensitivity if the channel bandwidth increases to 80 MHz? - We do not have enough information to answer this question - -61 dBm - -67 dBm - -64 dBm - -76 dBm
-64 dBm
Which of these is the strongest RX signal level? - -65 dBm - -70 dBm - -90 dBm - -80 dBm
-65 dBm
Given a noiseless channel of 30 KHz and 4 signal levels, what is the maximum bit rate you can get on that channel? 120 Mbps 1.2 Mbps 12 Mbps 0.12 Mbps
.12 Mbps
What is the frequency of Direct Current? 5 Hz 0 Hz 2 Hz 10 Hz Cannot be determined since it is infinite
0 Hz
What is the queuing time of a channel if it has a total latency = 42.91 sec, a transmission time = 28.5 sec, propagation time = 13.9 sec, and processing delay = 0.01 sec? 0.5 s 5 s 1 s 0.2 s
0.5s
What is the result of 1001 ⊕ 1010? 0011 1011 0101 1100
0011
Suppose we have a data word = 0011. What should be the codeword if we use even parity? 11001 00111 0110 0111 00110
00110
What is the result of 10011 ⊕ 11111? 11001 01100 00000 10011
01100
What would be the first 3 bytes of the MAC address of a host in a local network for a Multicast Group? The vendors ID number 01:00:5E 3 bytes are synthesized based on the Multicast Group IP address The serial number for that specific interface card
01:00:5E
What is the range of frequencies for data upstream and data downstream in DOCSIS? - 05- 42 MHz, 54-550 MHz - 05- 54 MHz, 550-750 MHz - 05- 42 MHz, 550-750 MHz - 05- 42 MHz, 54-750 MHz
05- 42 MHz, 550-750 MHz
An IPv4 packet has arrived with the first few hexadecimal digits as shown below: (45000028001100000102 ... )HEX16 How many hops can this packet travel before being dropped? (Write the number only) [ IMAGE ]
1
How many bit(s) per baud for a standard 0 and 1 data pattern? 4 There is no relation between bit and baud 1 2
1
How many set of data lines carry the DC power on Gigabit Ethernet? 2 1 3 4
1
0 dBm is defined as __________? - 1 mWatt - 1 mV - 1 Watt - 0 mWatt
1 mWatt
Given the frequency f = 1 MHz, find the period T: 1 s 1ns 1 ms 1 µs
1 us
Which of the followings are features of IMAP servers? (3) Emails are stored on remote servers Even though the mail is stored on the server, it knows what emails you have read or not Take minimal time to download and synchronize from any remote server Cannot access emails from any location even with Internet access Two-way communication
1. Emails are stored on remote servers. 2. Even though the mail is stored on the server, it knows what emails you have read or not. 3. Two-way communication.
Which of the following are characteristics of POP email? (4) One-way communication emails are not available without Internet access Synchronization between devices that retrieve the emails Automatically downloads all attachments Stores emails on local computer Uses the MAA software
1. One-way communication 2. Automatically downloads all attachments. 3. Stores emails on a local computer. 4. Uses the MAA software
MIME allows _________ to be sent through e-mail. (3) audio files encrypted data non-ASCII data passwords ASCII data images
1. audio files 2. non-ASCII data 3. images
Regarding network impairment, voice over IP needs high priority in: (2) Bandwidth Reliability Delay Jitter
1. delay 2. jitter
Regarding network impairment, streaming video needs high priority in: (2) Reliability Jitter Delay Bandwidth
1. jitter 2. bandwith
Verizon Wireless use the 700 MHz Block C for its LTE service. What is the period of a signal operating at 750 MHz? 1.33 s 1.33 ns 1.33 ms 1.33 ps
1.33ns
What are the performance parameters of a network? (4) Delay Reliability Jitter Bandwidth Accuracy Security
1.Delay 2. Reliability 3. Jitter 4. Bandwith
Which of the following Coding Rates provides the best resistance to a noisy channel? - 2/3 - 5/6 - 3/4 - 1/2
1/2
Rewrite the following IP address using dotted decimal notation: (Don't forget to put the dots in!) 00001010 00000001 00100100 10011000
10.1.36.152
What is the throughput of the path from the source to the destination in the following picture? [ IMAGE ] - 150 Kbps - 100 Kbps - 200 Kbps
100 Kbps
Fast Ethernet provides: 100 MBps 100 Mbps 1000 Mbps 10 Mbps 10 Gbps
100 Mbps
In which year packet switching theory was developed? 1975 1988 1961 1960
1961
The AT&T monopoly was broken up into different companies in: - 1986 - the late 1960's - 1984 - 1990 - the early 70's
1984
What is the hexadecimal value for this bit stream? 0001 1111 1001 1011
1FAB
How many basic types of transmission media are there? 2 1 3 4
2
How many bits/baud does this system in Figure 4 support? 3 1 We cannot tell based on the information 2 4
2
How many nibbles in a byte? 1 4 2 8
2
If coded bits per subcarrier value is 2 then what is the how many of bits per baud are there? - 4 - We do not have enough information from the question to know - 2 - 8 - 1
2
If the coding rate is 2/3, then how many of the bits being transmitted are data bits? - 3 - 2 - 1 - 6
2
What is the number of stop bits in the serial port configuration 8, N, 2? None 8 2 0
2
What is the typical range of frequency for sky propagation? Above 30MHz 2-30 MHz Below 2MHz 2-30Hz
2-30 MHz
How many types of device are there in a network
2. Connecting and host device.
If you were able to send 54 Mbps (a typical Wi-Fi air data rate) in a 20 MHz RF channel, what is the Spectral Efficiency of that data signal? (NOTE: more than one answer may be correct) 2.08 MHz/Mbits 0.37 bits/Hz 2.7 Mbits/MHz 2.08 Hz/bits 2.7 bits/Hz
2.7 Mbits/MHz, 2.7 bitz/Hz
What is the port number for the upload link on a FTP server? (just the number only)
20
What is the length of a typical IP datagram header? 12 bytes 20 bytes 16 bytes 24 bytes
20 bytes
What is the minimum packet size for an IP datagram? - There is no minimum size specified - 20 bytes - 65,535 bytes - 60 bytes
20 bytes
What is the minimum and maximum size of IP datagram header? - 20 Kbytes, 60 Kbytes - 20 bytes, 60 Kbytes - 20 bytes, 60 bytes - 20 bytes, 60 Mbytes
20 bytes, 60 bytes
What is the minimum and maximum size of an IP datagram? - 20 Mbytes, 65 Mbytes - 20 bytes, 60 Kbytes - 20 Kbytes, 65 Kbytes - 20 bytes, 65 Kbytes
20 bytes, 65 Kbytes
Given the data rate = 4Mbps, message size = 50MB, propagation delay = 45msec, queueing time plus processing delay = 30msec, calculate the round-trip time. 200.12 sec 12.62 sec 100.12 sec 200 sec
200.12 sec
What is the port number for the control link on a FTP server? (just the number only)
21
Which of the followings are valid Multicast Addresses? 226.11.2.8 233.91.156.208 10.1.0.4 192.168.0.23
226.11.2.8 233.91.156.208
T1 lines can carry ___ noise-free digitized telephone calls simultaneously
24
Given a data rate of 4Mbps and 6 µsec delay, calculate the bandwidth-delay product. 24 bits 24 Bytes 24 KB 24 Kb
24 bits
What is the size of a SONET STS-3 frame? - 2430 bytes - 2430 bits - 2 mega bytes - 2430 kilo bytes
2430 bytes
Which of the following modulation schemes requires the strongest receiver signal on a noiseless channel? - 64QAM - QPSK - BPSK - 256QAM - 16QAM
256QAM
Using the chart from the previous question, approximately how much dB loss would your signal lose on a 10-km link if your Laser LED had a wave length of 1200 nm? (round up/down to the nearest integer. Don't forget to add the proper label to you answer.)
5 dB
Which of the following Coding Rates provides the highest data throughput? - 2/3 - 5/6 - 3/4 - 1/2
5/6
What is the data rate of OC1? - 50.84 Mbps - 61.84 Mbps - 51.44 Mbps - 51.84 Mbps
51.84 Mbps
What is the size of ATM frames? - 53 bytes - 53 Kbytes - 1024 bytes - 50 bytes
53 bytes
If the wavelength of signal in free space is 2.036 inches long. What is the frequency of that signal? 5.8 GHz 17.7 GHz 889 MHz 483 MHz 5801 MHz
5801 Hz
If f is the fundamental frequency, which of the following harmonic(s) can be used to make a square wave? (2) 7.5f 5f 2f 3f 4f
5f, 3f
How many bytes are Ethernet MAC addresses? 2 8 6 4
6
How many bytes in an Ethernet MAC address? 4 48 8 6
6
What is the occupied bandwidth of each channel shown in the following picture? [IMAGE] - 300 KHz - 30 MHz - 6 MHz - 757.40 MHz
6 MHz
Which of the following bands are supported by IEEE 802.11ad Band? - 60 GHz - 24 GHz - 90 GHz - 72 GHz
60 GHz
What is the maximum packet size for an IP datagram? - 60 bytes - 20 bytes - 65,535 bytes - There is no maximum size. It can be as big as the network can handle.
65,535 bytes
What is the wavelength in feet of an AM radio station signal that is operating at 1500 KHz? 7.874 ft 7874 ft 0.656 ft 656 ft
656 feet
Given a channel's bandwidth = 15 MHz, signal level at the receiving end = 10 Watts and noise level at the receiving end = 500 mWatts, calculate the capacity. 6.5 Mbps 60 Mbps 66 Mbps 6 Mbps
66 Mbps
DS-3 lines transports ___ 64-Kbps voice channels.
672
Before a company could sell any device that connects to the PSTN, it needs to pass FCC Part ___ rules.
68
How many layers are there in the OSI model? 6 4 5 7
7
If an IP Datagram has the header length (HLEN) bits 0110 and the total length of the datagram is 100 bytes, the payload length is ______ bytes. (REMEMBER: Length of the Payload Data = Total length of Datagram - HLEN x 4)
76 (bytes)
A LEOS (Low Earth Orbiting Satellite) orbiting 149 miles above the earth and is sending a radio data signal traveling at the speed of light (186,282 miles/sec). If the satellite is directly over the earth station's dish antenna, how long will it take before the first bit of data from the earth reaches that satellite? None of the answers are correct 800 sec 7.99 mSec 79 µSec 799.86 µSec
799.86 uSec
If we translate the IPv4 address into a hexadecimal number, how many hexadecimal digits will it have? - 2 - 32 - 4 - 8
8
What is the port number used by a HTTP server? (write the number only)
80
Given a data rate to a Server is 100 Mbps and you have a 1MB of data (overhead and payload) to upload, how long will it take to "fill the pipe" with the data? 100 usec 800 msec 8 secs 10 msec 80 msec
80 ms
Which IEEE 802.11 spec is referred to as the 'Wave 2' in the industry? - 802.11n - 802.11a - 802.11g - 802.11h - 802.11ac
802.11ac
Operation on the 60 GHz band is covered in the IEEE _____ specification. - 802.11g - 802.11ab - 802.11ad - 802.11ac - 802.11n
802.11ad
Which IEEE standard support Transmit Power Control (TPC)? - 802.11c - 802.11a - 802.11d - 802.11h
802.11h
Suppose we are transferring data at 700 Mbps. What would be the rate in Bps? 8.75 x 10^6 875 x 10^6 87.5 x 10^6 0.875 x 10^6
87.5 * 10^6
A wavelength in free space is 134.2 inches long. What is the frequency of that signal? 8.801 MHz 88.01 KHz 88.01 MHz 88.01 Hz
88.01 MHz
Rewrite the following IP addresses using Hexadecimal dotted-decimal notation: (Don't forget to put the dots in!) 10001011 11000110 11010010 00110001
8B.C6.D2.31
A proxy server sits between ________. Two client applications A client application and a real server Two servers
A client application and a real server.
In a bi-directional ACK-type protocol link, what is Piggybacking? You and your Network buddy have Piggyback Races at a picnic Multiple data packets are combined into one Multiple ACKs are combined and sent back to the sender ACK and other data get sent back to the sender in the ACK reply.
ACK and other data get sent back to the sender in the ACK reply
Where does L2CAP passes the packets in a hostless system? - Host Controller Interface (HCI) - Switch - ACL/ASB/PSB link - Router
ACL/ASB/PSB link
The Control Connection uses the _________ character set. (write down in capital letters abbreviation)
ASCII
What can be used to connect wireless hosts to a wired infrastructure? - Switch - Modem - USB Hub - Access Point
Access Point
What is the purpose of a control frame? - CRC checking - Accessing the channel and acknowledging frames - Initial communication between stations and Aps - Carrying data and control information
Accessing the channel and acknowledging frames
Long coax and Ethernet cables: act like high pass filters act like low pass filters are good conductors and evenly attenuate all frequencies only effects the amplitude of the fundamental signal frequency from one end to the other
Act like low pass filters
What can be done to make FTP secure? Jumble the texts Encrypt the texts Add a Secure Socket Layer Reverse the texts
Add a Secure Socket Layer
What does ARP stand for? Address reverse protocol Address reserve protocol Address reconfigure protocol Address resolution protocol Association of Retired Persons
Address Resolution Protocol
Which of the following is the example of a half-duplex data flow? USB All Walkie-talkie Bluetooth
All
RF transmitters who use omnidirectional antennas radiate signal to which direction? Downward Upward Vertical All directions
All directions
What are the services supported by SSH?(4) Tunneling Forwarding Remote command execution Remote login
All of them.
To have Dial-up Internet Access, you need: - An account with a dial-up Service Provider - A Telephone Modem - The number to call in to access the service - A land-line and telephone number - All the options
All the options
What does AT&T stand for? - American Telephone and Telecommunications - American Telephone and Telegraph - Associated Telephone and Telegraph - American Telegraph and Telephone - Does not stand for anything anymore. It's just "AT&T Inc."
American Telephone and Telegraph
What can be used to increase the amplitude of the signal? Filter Amplifier Coax cable Rader Antenna
Amplifier
Which of the following is/are true when converting a demodulated RF signal with data on it back to digital form? (2) Anything above the slicing point is one Anything above the slicing point is zero Anything above the slicing point gets cut off Anything below the slicing point is zero
Anything above the slicing point is 1 Anything below the slicing point is 0
Which of the following is true? Analog signal can choose from infinite number of values over a period of time Digital signal can choose from infinite number of values over a period of time Analog signal can choose from a limited number of values over a period of time
Analog signal can choose from infinite number of values over a period of time
When do we have refraction? (Can have multiple answers)(2) Angle of incidence I < Critical angle Angle of incidence I = Critical angle There is no relation between angle of incidence and critical angle Angle of incidence I > Critical angle
Angle of incidence I < Critical angle, and Angle of incidence I = Critical angle
When do we have reflection? Angle of incidence I > Critical angle There is no relation between angle of incidence and critical angle Angle of incidence I = Critical angle Angle of incidence I < Critical angle
Angle of incidence I > Critical angle
A sine wave carrier can be modulated by a change in: amplitude phase Any of the answers frequency
Any of the answers
What is/are the advantage(s) of license free bands?(2) Transmission power is unlimited Anyone can buy and deploy anywhere in US with FCC certified equipment Less expensive than licensed band gear No interference is typical
Anyone can buy and deploy anywhere in US with FCC certified equipment less expensive than licensed band gear.
SSH sits under the ___________. Transport Layer Data Link Layer Application Layer Network Layer
Application Layer
Why is it important that the router or host receiving a Datagram from the Data Link Layer know the length of Datagram Header? - So a checksum can be computed - Needs to make sure that the total length of Header does not exceed its maximum value - All of the options are correct - Because at the next "hop" on the datagram transfer, the router will know when the payload data starts
Because at the next "hop" on the datagram transfer, the router will know when the payload data starts
Which of the following is a Wireless Personal Area Network(PAN)? - Wi-Fi - Near Field Communications - Cellular network - DASH7 - Bluetooth
Bluetooth
Which of the following have a limited scope and are kept on a very small subnet of the network? Broadcast ARP Requests Unicast Multicast
Broadcast
What is the difference between broadcast and multicast packets? Not much. They are essentially the same. Multicast sends packets to all the hosts on a network at the same time and Broadcast only to those who request to join the stream Broadcast sends packets to all the hosts on a network at the same time and multicast only to those who request to join the stream Multicasts are kept on a very small subnet of a network
Broadcast sends packets to all the hosts on a network at the same time and multicast only to those who request to join the stream.
Which of the following advantage is incorrect for the following network topologies Mesh: secure Star: robust if the hub is working Bus: reliable Ring: easy fault isolation
Bus: reliable
What can be used to convert analog signals into digital data? Oscilloscope Router CODEC Electric pulse
CODEC
What is added to each data frame to detect corrupted frames in Stop and Wait protocol? CRC CDC ACK Timer
CRC
Who forces the stations to send reservation messages when they find the channel is idle? - DCF - CSMA/CD - PCF - CSMA/CA
CSMA/CA
Which of the following is a disadvantage of layering? Machines at each level cannot be changed without affecting the others Separate service from implementation Breaks down the task into small parts Can have some cost in efficiency
Can have some cost in efficiency
How would the PCF virtually eliminate Hidden Node Collisions? - It uses an RTS/CTS to minimize collisions - A client backs off a random amount of time before checking to see if the channel is clear - Collision during RTS prevents CTS from being sent since both RTS-sending stations back off and retry - Clients only transmit data when polled
Clients only transmit data when polled
How do the bidirectional amplifiers in cable systems get power? - They have batteries inside - They are charged from time to time - A separate power line runs along with the Coax cable - Coax cables carry the DC power
Coax cables carry the DC power
What is Channel Bonding? - Combining channels to reduce noise - Combining signals to reduce interference - Combining channels for load balancing - Combining two or more channels to increase throughput
Combining two or more channels to increase throughput
Telecommunication means what? Communication with a telephone Communication at a distance Communication in the basic binary form Communication in the most elementary form
Communication at a distance.
Which of the following packet is used for configuration? Termination-request Termination-ACK Echo-reply Configure-request
Configure-request
TCP is a _________ and ________ protocol. Connectionless, reliable Connection oriented, reliable Connectionless, unreliable Connection oriented, unreliable
Connection oriented, reliable
IPSec creates a ___________ service. Connection oriented Connectionless
Connection-oriented
Which of the following is/are related to Multimode Step index? (Can have multiple answers)(2) Very little distortion Constant density through the core Abrupt reflections Horizontal light travelling
Constant density through the core, abrupt reflections
The purpose(s) of the foil and braded shield on coax cable is (are) to _____. (3) Contain all the signals inside the cable from leaking (radiating) out Prevent external noise and other RF signals from coupling onto the center conductor Provide lower signal loss per foot than unshielded cables Give the cable physical strength Physically protect the inner conductor
Contain all the signals inside the cable from leaking (radiating) out, prevent external noise and other RF signals from coupling onto the center conductor, and provide lower signal loss per foot than unshielded cables.
Which of the following(s) is/are responsibilities of IANA?(3) Setting up the security standards Coordinating some elements that keep the Internet running smoothly Allocation and maintenance of unique codes and numbering systems that are used in the protocols Assigning the vendors a 3-byte MAC address IDs
Coordinating some elements that keep the Internet running smoothly Allocation and maintenance of unique codes and numbering systems that are used in the protocols Assigning the vendors a 3-bytes MAC address IDs
Looking at the Cable TV spectrum below, what can you say about these channels? (Note that you do not know the frequency range shown on the screen.) [IMAGE] What type of signals are these channels? - Analog TV channels - These are just noise signals - Digital Data from the Internet - Digital TV Channels - Could be Digital TV Channels and/or Digital Data from the Internet since we do not know the frequency.
Could be Digital TV Channels and/or Digital Data from the Internet since we do not know the frequency.
A modular connector typically has _________ plated pins. silver gold copper chrome
gold
Which of the following is not true?(2) IP performs no flow or error control ARP maps IP address to physical address DHCP is used for congestion control Actual routing is not IP's responsibility
DHCP is used for congestion control Actual routing is not IP's responsibility
If the destination IP address of a TCP/IP packet is not known, then who provides the address?(2) DNS Router Gateway Domain name Server
DNS Domain Name Server
What type of modulation has been used on the right side of the following diagram? [ IMAGE ] - OFDM - FHSS - GSM - DSSS
DSSS
Which of the following modulation schemes uses a very fast pseudo-random bit stream? - FHSS - DSSS - OFDM - BPSK
DSSS
What are the sublayers of Data Link Layer? Data link control and media access control Media control and error control Data link control and routing control Framing control and congestion control
Data link control and media access control
Which pairs are used to carry DC voltage in mode A for Ethernet cables? used pairs voltage pairs data pairs unused pairs
Data pair
What is the name of the packet for the Network Layer? - Datagram - Segment - Bits - Messages - Frame
Datagram
Packets used by the IP are called ___________. - Frames - Messages - Bitstreams - Datagrams
Datagrams
Ethernet cables with only TX and RX data lines will transfer DC power to the powered device. False Depends if the Power Sourcing Equipment (PSI) is a Mode A or Mode B device True
Depends if the Power Sourcing Equipment (PSI) is a mode A or Mode B device
Referring to the following Data Rate - Range chart, what license-free technology would you use? [ IMAGE ] - LTE Cat-1 - LTE Cat-M1 - UNB (SigFox) - Depends on my application! - NB-IoT - RPMA - EC-GSM
Depends on my application!
Which node(s) will decapsulate frames in the Data Link Layer ? (2) Destination node Nodes in between source and destination Source node None
Destination node, nodes in between source and destination
How are optical fibers specified? Diameter of the core + diameter of the cladding Diameter of the core / diameter of the cladding Diameter of the core X diameter of the cladding Diameter of the cladding / diameter of the core Diameter of the core - diameter of the cladding
Diameter of the core/diameter of the cladding
What is the typical flow of a DHCP operation? - Discovery packet, offer, request, acknowledgement - Request, offer, request, acknowledgement - Discovery packet, acknowledgement
Discovery packet, offer, request, acknowledgement
What is fragmentation? - Division of a large frame into smaller ones - Division of a frame into data frame and error control frame - Combining multiple frames into a large frame - Division of a frame into single byte portions
Division of a large frame into smaller ones
What does DNS stand for? Domain Name Service Domain Network Service Domain Name System Decision Name System
Domain Name System
Which is NOT a characteristic of data effectiveness? Accuracy Delivery Timeliness Efficiency Jitter
Efficiency
Which are of following are services does the Data Link Layer never provide? Error Detection Flow Control Error Correction Congestion Control Framing
Error Correction
What is the price of mobility in wireless networks? - Affected by too much noise - Signal strength is poor - More costly - Error detection is problematic
Error detection is problematic
What are the phases before PPP enter the open data transfer phase? Authentication Establishment and flow control Establishment, authentication and network phase Establishment and data exchange
Establishment, authentication, and network phase
A datagram can only be fragmented by the source host. True False
False
All Ethernet ports in a router use the same MAC address. True False
False
Data is stored by the switches in a circuit switched network True False
False
Each link layer protocol follows the same frame format. True False
False
Ethernet ports can only have one IP address.. True False
False
In an interactive FTP session, the data connection remains active for the entire session. True False
False
Special private IP addresses are available for multicast addressing. True False
False
The source and destination link addresses and the IP address change with each hop True False
False
The values of the source and destination IP address in the datagram header of a TCP/IP packet may change during the travel from the source to the destination. True False
False
Which of the following is true? Bits and bytes are signals Physical layer is the actual transmission medium Fiber optics uses light pulses created by laser LEDs Wi-Fi uses pulse on the carriers
Fiber Optics uses light pulses created by laser LEDs
If we compare a datagram to a postal package which of the following(s) is/are true?(2) Header is the information written on the package Payload is the content of the package Header is the stamp of the package Payload is the information written on the package
Header is the information written on the package Payload is the content of the package
Which of the following is not an application layer protocol? FTP ICMP DNS HTTP
ICMP
Which protocol is used with IPv4 to assist in multicasting? - ICMPv4 - ICMP - ARP - IGMP
IGMP
Which types of IP packet are used by routers and clients to let routers know which interfaces have multicast receivers? ICMP IGMP ARP TCP/IP None of these answers are correct
IGMP
Error checking of the datagram header of a TCP/IP packet is the responsibility of _______? UDP IP IGMP TCP
IP
The datagram header of a TCP/IP packet is added by_______? FTP IP ICMP UDP
IP
What is the core protocol of network layer? IP UDP FTP TCP
IP
What can be thought as the main protocol for Network Layer in IPv4? - ICMPv4 - IPv4 Datagram - ARP - IGMP
IPv4 Datagram
Below is the format of the first row of an IP datagram header [ IMAGE ] If the first four bits indicate the version number and a packet has arrived with the first 10 bits as (0110 0010 11) then what is IP version used? - IPv4 - Cannot determine from this information - IPv8 - IPv6
IPv6
In which of the following condition do we have to add padding to the IP Datagram? - If the IP Datagram is more 20 bits - If the IP Datagram is less than 20 bytes - If the IP Datagram is less than 46 bytes - If the IP Datagram is more than 46 bytes
If the IP Datagram is less than 46 bytes
How did the trunk lines handle communication between offices? - Multiplexing/Demultiplexing - Routing - Circuit switching - Packet Switching
Multiplexing/Demultiplexing
What does ISM stand for? _______
Industrial Scientific (and) Medical
Who uses D-DSSS (Dynamic - Direct Sequence Spread Spectrum)? - LoRaWAN - Ingenue - SIGFOX - LTE cell systems
Ingenue
Which of the following is not a child organization of the Internet Society? Internet Research Task Force Internet Architecture Board Internet Standards Committee Internet Engineering Task Force(IETF)
Internet Standards Committee
When a signal travels through a medium ________________ it loses some of its energy it gains some energy it does not have any change in the energy level
It loses some of its energy.
In case of RS232, which bit is sent and received first? Stop bit Parity bit MSB LSB
LSB
Which of the following provides highest data rate? - LoRaWAN - NB-LTE - LTE CAT 1 - LTE CAT 1M
LTE CAT 1
Which of the following provides highest RX bandwidth? - LoRaWAN - LTE CAT M - NB-LTE - Narrow-Band
LTE CAT M
Which technology has highest TX data rate? [ CHART ] - LTE Cat M1 - LoRan - LTE-NB1 (NB-IoT) - LTE Cat-1 - NarrowBand (SigFox)
LTE Cat-1
Which technology has highest TX power option? [ CHART ] - NarrowBand (SigFox) - LTE-NB1 (NB-IoT) - LTE Cat-1 - LoRaWAN - LTE Cat M1
LTE Cat-1
Which portion of a MAC address is synthesized based on the Multicast Group IP address? First 3 bytes Last 2 bytes Last 4 bytes Last 3 bytes
Last 3 bytes
Which layer appends the 7 preamble octets to create the Ethernet packet? Layer 4 Layer 3 Layer 2 Layer 1
Layer 1
What do we call the part of this fiber optic link that goes from the STS MUX to the ADM? - Path - Section - Line - Tap
Line
What does LCP stand for? Link Control Protocol License Control Protocol Line Control Protocol Layer Control Protocol
Link Control Protocol
What could be the first step of a PPP connection's lifecycle from the following options? Data transfer Authentication Network layer configuration Link layer configuration
Link Layer configuration
Which of the following is based on Chirp Spread Spectrum(CSS)? - LoRaWAN - Weightless - Ingenue - SIGFOX
LoRaWAN
LAN stands for Local access network Large area network Large access network Local area network
Local Area Network
What does L2CAP stands for? - Link Layer Control and Application Protocol - Link Layer Control and Adaptation Protocol - Logical Link Control and Adaptation Protocol - Logical Layer Control and Ad-hoc Protocol
Logical Link Control and Adaptation Protocol
Which of the following is true? Logical connection between the same layers on each side is implemented within the layer itself Logical connection between the same layers on each side is provided by the layers under them Logical connection between the same layers on each side is provided by the layers over them
Logical connection between the same layers on each side is provided by the layers under them.
What are the two large categories of the wireline telephone companies in the United States? - Long distance and Local Exchange Carriers - Long distance and Short distance carriers - Nationwide and Statewide carriers - Federal carriers and State carriers
Long distance and Local Exchange Carriers
LPWA stands for ______ devices? - Less Power, Wide Area - Low Power, Wireless Adapter - Low Power, Wide Area - Low Power, Wireless Area - Limited Power, Wireless Adapter
Low Power, Wide Area
The throughput of a network path is equal to the ____________ throughput of any link in that path.
Lowest
If the Access Point is transmitting and has multiple antennas and the client has only one antenna, then what type of system is it? - SIMO - MIMO - SISO - MISO
MISO
What software is used to transfer emails from one computer to another? MUA MTA SMTP MAA
MTA
What is/are the advantage(s) of licensed bands?(2) Many more frequencies available Protected from interference Less expensive than licensed band Less transmission power authorized
Many more frequencies available, and protected from interference
What is the largest PDU a layer can pass onwards? Minimum Transfer Unit of the next layer Optimal Transfer Unit of the next layer Highest Transfer Unit of the next layer Maximum Transfer Unit of the next layer
Maximum Transfer Unit of the next layer.
What are the advantages of fiber optic cable from the following list?(3) Heavier than copper cables. More secure than copper cables Higher bandwidth than coax or twisted pair Immune to electromagnetic interference Higher attenuation than coax or twisted pair
More secure than copper cables, higher bandwith than coax or twisted pair, and immune to electromagnetic interference
What does a Data Link Layer support to forward a multicast packet at the Data Link Layer? ARP protocol Multicast IP address The IP Multicast MAC address
Multicast MAC address
Data Link Layer provides service to the ______ Network layer Transport layer Application layer Physical layer
Network layer
Which layer is responsible for routing in the OSI model? Network layer Data link layer Transport layer Session layer
Network layer
What is the use for 'options' in the datagram header of a TCP/IP packet? Error recovery Routing Performance measurement Network testing and debugging
Network testing and debugging
What are the terms used for hosts/routers and the networks in between them in the Data Link Layer ? Device, lines Stations, lines Hops, lines Device, links Nodes, links
Nodes, links
Given the signal power = 120uW and noise power level = 1 uW, calculate SNRdB. 0.209 dB 2.09 dB 209 dB None of the answers are correct 22 dB
None of the answers (20.9)
PAP is: requires that both the client and server know the plaintext of the secret is 100% secure and has not be broken None of these choices are correct is a better method of authentication then CHAP a nickname for POP
None of these answers are correct
Which of the following(s) is/are true about the header checksum? (3) Not a security feature Sum of the entire header including the checksum Does not need to be recalculated at each hop Value should be zero if there is no corruption Sum of the entire header excluding the checksum
Not a security feature Sum of the entire header including the checksum Value should be zero if there is no corruption
Doubling the occupied bandwidth doubles the air data rate; which theorem implies this? - Ohm's law - Euler's theorem - Shannon theorem - Nyquist Theorem
Nyquist Theorem
Which layer sends the actual bits through the link? Network layer Data link layer Physical layer Transport layer
Physical Layer
The Echo Request Query ICMP message is used for the ____ and ____ applications - Ping, Traceroute - Discovery, Traceroute - Ping, Discovery - Discovery, Acknowledgement
Ping, Traceroute
Which of the following connection type is used by bus topology? Point to point Point to multipoint Multipoint
Point to multipoint
What type of address is used in the transport layer? Names Port number Logical address MAC address
Port Number
Which portion of an IPv4 address defines the Network?
Prefix
Which layer is responsible for encryption and decryption in the OSI model? Network layer Application layer Transport layer Presentation layer
Presentation layer
Communication at the Application Layer is a _____. Process to process communication Router to router communication Interstellar communication communication between persons
Process to process communication
What is the time required for the router or the destination host to open and inspect the packet? - Processing delay - Queuing delay - Propagation delay - Transmission delay
Processing delay
Which of the following is/are true? Propagation time is the time it takes for the complete data packet from the Sender to the Receiver Propagation time is the time it takes for the first data bit from the Sender to get to the Receiver Transmission time is the time it takes for the complete data packet from the Sender to the Receiver Transmission time is the time it takes for the first data bit from the Sender to get to the Receiver
Propagation time is the time it takes for the first data bit from the Sender to get to the Receiver.
What is a PDU? Partial data unit Protocol data unit Partial datagram unit Programmable data unit
Protocol Data Unit
What is the name of the "http://" part of an URL? Resource Name Protocol Identifier
Protocol Identifier
Which field in the IP datagram is set to 1 to indicate that the IP payload is an ICMP message? - Protocol field - First byte in the header - There is no field in the datagram to indicate that - ICMP flag field
Protocol field
Error checking of the payload of a TCP/IP packet is done by______? FTP IP MTP Checksum Protocol that owns the payload
Protocol that owns the payload
Which of the following is used for analog phone lines? RJ50 RJ11 RJ45 RJ23
RJ11
In the diagram, what does T1 represent? [ IMAGE DEPICTING T1 BETWEEN DIFS AND RTS ] - SIFS time - RTS packet transmission time - Propagation delay - DIFS time - Delay in the source preparing the RTS packet
RTS packet transmission time
Which choice is an example(s) of transition mediums? (2) Radio waves Cat 5 Cable Router Phone
Radio waves, Cat5 Cable
What is the central concept in detecting and correcting errors? Redundancy Parity bits Sending multiple packets Resending data
Redundancy
Where is Infrared still in common use? Laptop to printer link Wireless headsets Bluetooth Remote controls for home entertainment
Remote controls for home entertainment
What type of login requires a terminal emulation program? Local login Remote login
Remote login
Higher order of modulations means more bits per baud. This means they also need better SNR according to ______? - Shannon Law - Ohms Law - Bochner's theorem - Nyquist Theorem
Shannon Law
What do we need while designing a wireless data communication system? Nyquist formula Prof Young's assistance! None of them Shannon's theorem Shannon's theorem and Nyquist formula
Shannon's theorem and Nyquist formula
What is the legacy name of High Frequency (HF) band? Short wave Long wave Microwave Millimeter wave
Short wave
ATM switches act like a ________? - Switch - Repeater - Router - Regenerator
Router
Which one is the fragment number and sequence number for the frame in the following picture? [ IMAGE ] - FCS - FC - D - SC
SC
What protocols can be used by SSH to transfer files?(2) FTP SCP SFTP CP
SCP, SFTP
What is the primary factor in determining if a wireless data packet is successfully received and decoded error free? - Received signal level - Distance the signal has to travel (i.e., free space loss) - SNR at the receiver - Transmit Signal Level - Noise level at the receiver
SNR at the receiver
Which protocol mostly superseded Telnet? HTTP SSH SMTP IGMP
SSH
Which is the ideal networking cable in high EMI environments? UTP CAT5 STP SSTP
SSTP
Who modulates and demodulates the light on the fiber optic cable? - OC - STM - STS - TDM
STM
What do we call the part of this fiber optic link that goes from the STS MUX to the regenerator? - Path - Tap - Line - Section
Section
Which of the following is an example of a fixed high data bandwidth IoT device? - Tracking devices - Security cameras with bidirectional communication - Light controllers - RFID devices - Thermostats
Security cameras with bidirectional communication
How can we execute a DoS attack? - Sending millions of blank IP packets of the allowed size by the IP protocol - Sending an IP packet with appropriate size but with no data - Sending an IP packet larger than the number of bytes allowed by the IP protocol - Sending an IP packet smaller than the minimum number of bytes allowed by the IP protocol
Sending an IP packet larger than the number of bytes allowed by the IP protocol
When do we use the term "bandwidth" to measure throughput over a given time? Sending data Sending analog signals Sending radio frequency
Sending data
Which of the following(s) is/are increased by increasing bit rate? (3) signal bandwidth higher frequency components of fundamental frequency signal strength fundamental frequency
Signal bandwith, higher frequency components of fundamental frequency, and fundamental frequency
What can cause out of phase signal? - Noise - Interference - Attenuation - Propagation delay - Signal reflection causing multipath propagation
Signal reflection causing multipath propagation
Traditionally, which protocol(s) has/have been defined for the Data Link Layer to deal with flow and error control?(4) Simple Stop and Wait Selective Repeat Go back N
Simple, Stop and Wait, Selective Repeat, and Go Back N
Which of the following(s) is/are not factor(s) in determining the total delay for a packet over a network? - Propagation delay - Size of the packet - Queueing delay - Processing delay - Transmission time
Size of the packet
Why some of the channels may remain idle in Synchronous TDM? - Some devices have no information to send and their slots remain empty. But the frame is still transmitted which creates idle channels - Idle channels are needed for error checking - Idle channels help to reduce interference - Idle channels are reserved. If the system is too much clogged with data, then they are used to minimize clogging
Some devices have no information to send and their slots remain empty. But the frame is still transmitted which creates idle channels
The Capacity/Bandwidth Ratio for a given signal is a measure of ____? Occupied Bandwidth Spectral Efficiency Data throughput Signal to Noise ratio (SNR) Air data rate
Spectral Efficiency
DSSS ____ - Spreads the signal out by XOR-ing it with fast pseudo-random bit steam - Has the radio signal frequency hop randomly from on channel to another in the band - Has multiple carriers, each with its own low-rate bit stream - Widely used in modern data transmission
Spreads the signal out by XOR-ing it with fast pseudo-random bit steam
Which of the following topology is used typically in a home network? Mesh Ring Bus Star
Star
Which of the following topologies does not belong to the corresponding connection type category? Ring -> Point-to-point Star -> Multipoint Mesh -> Point-to-point Bus -> Point to multipoint
Star -> Multipoint
Which connector is typically used to connect high-end networking devices? Subscriber channel (SC) connector Straight tip (ST) connector RJ45 MT-RJ connector
Straight tip (ST) connector
Which of the following uses push-pull locking system? Subscriber channel (SC) connector Straight tip (ST) connector MT-RJ connector
Subscriber channel (SC) connector
What is SONET? Synchronous oversea network A poem of fourteen lines using any of the formal rhyme schemes Synchronous optical networking Subscriber optical networking
Synchronous Optical Networking
What does STM stands for? - Synchronous Transfer Module - Serial Transfer Module - Synchronous Timing Module - Synchronous Time Division Multiplexing
Synchronous Transfer Module
Which of the following protocol is added to an email message to provide error free end to end delivery assurance IP Ethernet TCP ARP
TCP
What is the preferred name for the PDU in Transport Layer of the TCP/IP model? Network frame IP Datagram Message TCP Segment
TCP Segment
FTP is a _________ protocol. TCP/IP UDP/IP
TCP/IP
What is the type and size of a cookie? Audio file, 4Kb Binary file, 4KB Text file, 4KB Text file, 4Kb
Text file, 4KB
Why is Ethernet cables limited to 330 feet? (2) The delay of the higher frequency components in the composite signal arrive later then the fundamental and distort the wave form Too much DC resistance in the cable That is the maximum length the Electronic Industries Association (EIA) specifies that is it can be It acts like a low pass filter and attenuates the high frequency components
The delay of the higher frequency components in the composite signal arrive later then the fundamental and distort the wave form, and it acts like a low pass filter and attenuate frequency components.
Why are non-ASCII files that are attached to emails converted to ASCII text before being transmitted? The email protocol was mature and widely and only used ASCII data when non-ASCII data became popular and needed to be emailed. It was easier to implement MIME on top of the existing protocol rather then redo the SMTP, POP and IMAP protocol. The IANA wanted to give programmers more opportunity to make some more money by embedding the MIME code into email applications More reliable means of data transfer Easier to encode and decode
The email protocol was mature and widely and only used ASCII data when non-ASCII data became popular and needed to be emailed. It was easier to implement MIME on top of the existing protocol rather than redo the SMTP, POP, and IMAP protocol.
Which of the following(s) is/are provided by PPP?(3) The frame format Flow control Authentication Sequencing Data exchange
The frame format, authentication, and data exchange
When you compute and get a negative SNRdB it means that: The noise is greater than the signal it will likely have good data demodulation for one bit/baud signals nothing since this is not possible You made a mistake in your calculation
The noise is greater than the signal.
The difference between and Ethernet Frame and an Ethernet packet is: There really is no difference, it is essentially the same. The frame is a PDU, the packet is not The frame is the stream of data bits sent over the network and the packet is the digital bits before they get to the physical layer The packet is the stream of data bits sent over the network and the frame is the digital bits before they get to the physical layer
The packet is the stream of data bits sent over the network and the frame is the digital bits before they get to the physical layer.
A decibel is a measure of: Signal power Transmitter power The ratio between two signal levels All answers are correct SNRdb
The ratio between 2 signal levels
With a Coding Rate of 3/4, which statement is true? - There are 7 data bits sent, 4 for data 3 for FEC - There are 7 data bits sent, 3 for data 4 for FEC - There are 4 data bits sent, 4 for data 3 for FEC - There are 4 data bits sent, 3 for data 1 for FEC
There are 4 data bits sent, 3 for data 1 for FEC
In CRC decoder, if the syndrome is zero, then we can say: There is no error The codeword is invalid We cannot correct the detected error An error has been detected
There is no error
Which of the followings are true for a cookie? (3) They are a reliable mechanism for websites to remember "stateful" information Every time the user loads the website, the browser sends the cookie back to the server They are stored in the server They cannot store passwords and form content a user has previously entered They can record the user's browsing activity
They area reliable mechanism for websites to remember "stateful" information. Every time the user loads the website, the browser sends the cookies back to the server. They can record the user's browsing activity.
What does TDMA stand for? ______
Time Division Multiple Access
Look at the frequency distribution for DOCSIS below [IMAGE] Why there is a gap between the data upstream and the video band? - To reduce interference - Those frequencies are licensed - To allow filters - DOCSIS does not support that range
To allow filters
Why do we need DFS? - To allow license free wireless devices to coexist with the International Space Station - To allow license free wireless devices to coexist on frequencies with radar systems - To allow license free wireless devices to coexist with satellites - To allow license free wireless devices to coexist with radio waves
To allow license free wireless devices to coexist on frequencies with radar systems
What is the purpose of the preamble in Ethernet? To enable the data clock at the receive end to get in sync with the data To ensure error-free data reception at the receive end Indicating that data is to follow and prevent another device from using the line Simulate a square wave signal to enable the far end to auto-equalize the line
To enable the data clock at the receive end to get in sync with the data
The Marine Band voice radio channels in the 156 MHz frequency range are in the _____ band. Microwave VHF HF UHF
VHF
On fiber optic link, why is important in data recovery to extract the data clock on the receive end? - For error checking purposes - Only needed for the TDM signal to be de-multiplexed - To ensure that the data bit is sampled in the middle of the bit period - For Forward Error Correction (FEC) - To enable the link to operate at the highest data rate the cable can carry
To ensure that the data bit is sampled in the middle of the bit period
Why do we need protections rings in bidirectional switching ring? - To reduce noise - To communicate between multiple terminals - To regenerate the signals - To have backup for interface or hardware failure
To have backup for interface or hardware failure
Why do we need regenerators? - To strengthen a weak signal - To reduce interference - To reduce noise - To speed up the data transfer
To strengthen a weak signal
What is the responsibility of DNS? Translating domain names into IP addresses Translating domain names into MAC addresses Translating IP addresses into MAC addresses Translating IP addresses into domain names
Translating domain names into IP addresses
What is/are the disadvantage(s) of license free bands?(2) More expensive than license band gear Transmission power is limited Anyone cannot deploy it anywhere in US with FCC certified equipment Must have to accept interference
Transmission power is limited, and must have to accept interference
How does the applications send and receive messages? Transport layer Network layer Data link layer Application layer
Transport Layer
Which of the following contains quality functions? Network layer header Data link header Transport layer header Application layer header
Transport layer header
A single Multicast Address is an identifier for a group of many hosts. True False
True
CRC is good for detecting burst errors. True False
True
Circuit switching was used for telephone and telegraph networks before 1960 True False
True
Every time the data packet goes from one device to another, the source and destination MAC address change. True False
True
In the IP protocol, routers at each hop check whether the datagram header was corrupted during the transmission. True False
True
Link Layer address can also be called physical address, link address or MAC address True False
True
MTU parameters usually appear in association with a communications interface (NIC, Wi-Fi card, serial port, etc.). True False
True
Payload is the packet coming from other protocols that use the service of IP. True False
True
The IANA allows the world to use a specific MAC address at the local MAC interface that will let the Ethernet switch know that it is a destination for a specific Multicast Group. True False
True
The header checksum of the datagram header in a TCP/IP packet needs to be recalculated at each router. Correct Answer True False
True
The reassembly of a fragmented diagram is only done by the destination host. True False
True
UDP does not provide acknowledgements or error checking. True False
True
What is the main difference between Ethernet II and IEEE 802.3 frames? Type field in Ethernet II has been replaced with a 6-byte Length field in the IEEE formats Type field in Ethernet II has been replaced with an 8 octet Length field in the IEEE formats Type field in Ethernet II has been replaced with a 2-byte Length field in the IEEE formats Type field in Ethernet II has been replaced with a 4-byte Length field in the IEEE formats
Type field in Ethernet II has been replaced with a 2-byte Length field in the IEEE formats
What does UNB stand for? - No choice is correct - Unlicensed Network Band - Ultra-Narrow Band - Unusable Network Band - Unlicensed Narrow Band
Ultra-Narrow Band
What does URL stand for? Unified Resource Locator Uniform Resource Locator Uniform Resource Layer Uniform Resource Link
Uniform Resource Locator
UART stands for Universal asynchronous receiver transmitter Unified anypoint receiver transmitter Universal anypoint recorder transmitter Universal anypoint receiver transmitter
Universal asynchronous receiver transmitter
How is the packet delivery done in the Network Layer in multicasting? Using ARP protocol Using unicast for each destination Using multicast IP address Using multicast MAC address
Using multicast IP address
How does MIMO increase the range and reduce 'dead spots' in the wireless coverage area? - Using signal jamming - Using signal reflections - Using signal refraction - Using more powerful signals
Using signal reflections
For a sine wave VRMS = ? Correct! VPK * 0.707 VPP * 0.707 VPK * 0.605 VPK * (1/0.707)
VPK * .707
Which colors are NOT used in Ethernet cables? Brown and white/brown Green and white/green Orange and white/orange Blue and white/blue Violet and white/violet
Violet and white/violet
If a router connects a WAN to a LAN, then it receives the frame in _____________ format. WAN LAN LAN or WAN both is possible Cannot be determined
WAN
What is the meaning of Wi-Fi? - Wired Fidelity - Wireless Fiber - Wireless Firmware - Wireless Fidelity
Wireless Fidelity
Who's going to pass the exam?
You are.
Which of the following is/are (a) component of latency? Queuing time Transmission time all the options Propagation time Processing delay
all the options
ICMP is used by routers to ______. - find alternate route in case of a failure - control congestion in the network - find destination host - communicate error information or updates to other route, intermediary devices or host
communicate error information or updates to other route, intermediary devices or host
What is the command to get the IP address and MAC address that are reporting on you LAN? arp -s arp -ls arp -a arp -i
arp -a
What type of cookies are used to know whether the user is logged in or not? Authentication cookie Flow control cookie Tracking cookie Security cookie
authentication cookie
A change in the signal level is called a ____. pulse transition glitch baud
baud
What are the disadvantages of fiber optic from the following list? (3) Bidirectional communication requires two cables Special expertise required to install and maintain Higher attenuation than comparable lengths coax or twisted pair More expensive than copper cables
bidirectional communication requires two cables, special expertise required to install and maintain, and more expensive than copper cable
When calculating the Capacity/Bandwidth Ratio for a given bandwidth, what is the result given in? bits Hz/bits bits/sec bits/Hz
bits/Hz
Which of the following is correct? bps and Bps both can be used to mean bits or bytes per second both bps and Bps both is used to mean bits per second bps means bytes per second and Bps means bits per second bps means bits per second and Bps means bytes per second bps and Bps both means bytes per second
bps means bits per second and Bps means bytes per second.
Modulo-2 arithmetic ____ (More than one answer could be correct.)(2) can be used to determine if a codeword transmitted has damaged bits when received. can be used in creating error correcting parity bits for Hamming codes can be done with XOR gates in hardware can be used to produce even parity bit for a dataword
can be done with XOR gates in hardware, and can be used to produce even parity bit for a dataword
802.11n increases the data throughput by _____ - increasing the coding rate - increasing the bits/baud - channel bonding - operating on a different radio band
channel bonding
The IP protocol is a __________ protocol. - connection oriented - connectionless
connectionless
What are the conductors and insulation made of in a twisted pair cable? copper and glass copper and plastic iron and plastic gold and glass
copper and plastic
Routing is ________ and forwarding is __________ - action, decision - action, action - decision, action - decision, decision
decision, action
What is taken as the True signal level from a twisted cable? the signal relative to ground difference between two signals carried by the conductors average of the two signals carried by the conductors summation of two signals carried by the conductors highest level signal between the two carried by the conductors
difference between two signals carried by the conductors
Datagram header must be checked for errors at ______. - every hop - the destination host - only when needed at each hop along the path - the Transport Layer
every hop
Which of the following is a factor that determines whether a communication system is LAN or WAN? number of nodes distance size structure
distance
When you double the occupied RF bandwidth, you ____ - halve the air data rate - increases the RX signal level by 3 dB - double the air data rate - increases the RX signal level by 3 dB
double the air data rate
Which of the following(s) is/are example(s) of guided transmission media? (3) radio wave infrared fiber optic cable coax cable twisted pair cable
fiber optic cable, coax cable, and twisted pair cable
What do we call the identical objects in the data link layer of the TCP/IP suite? user datagram frame datagram message
frame
Which of the following limits the throughput of DSL? signal level frequency bandwidth propagation delay topology
frequency bandwith
The Internet uses a __________ name space.
hierarchical
The logical connection at network layer is between _____. hosts processes applications routers
hosts
Which of the following(s) is/are example(s) of unguided transmission media? (2) coax cable infrared fiber optic cable radio frequency signals
infrared, radio frequency signals
A network of networks is called an: (2) Intranet internet internetwork
internet, internetwork
Which of the following is equal to y = bx ? lobx(y) = b logy(b) =x logb(y) = x logy(x) = b
logb(y) = x
What is the name of the identical objects in the application layer of TCP/IP suite? frame segment message bits
message
For n devices in a network, what is the correct number of cable links required for a "star" topology? n-1 one backbone and n drop lines n(n-1)/2 n
n
Assuming the RX signal level is right at the threshold to get the SNR needed for error-free reception, what is needed when you double the occupied RF bandwidth and keep the same bits/baud of the RX signal? - need to decrease the RX signal level by 3dB - increases the SNR - need to increase the RX signal level by 3dB - Nothing. The air-data rate will just double.
need to increase the RX signal level by 3dB
Bluetooth is intended to create a _______. - vehicular ad-hoc network - personal area network - metropolitan area network - wide area network
personal area network
Which three parameters are used to define a sine wave? Time, amplitude, frequency Phase, amplitude, frequency Velocity, amplitude, frequency Frequency, phase, time Phase, modulation, time
phase, amplitude, frequency
The password in an FTP login is sent in _______. encrypted text jumbled text plaintext reversed text
plaintext
Which of the following factor(s) can affect throughput on the Internet? (3) queues in the backbone routers connection speed queues in the gateway routers protocol
queues in the backbone routers Connection speed Queues in the gateway routers
Ping calculates the _________ - propagation delay - queuing delay - transmission time - round trip time
round trip time
Treating packets (datagrams) in the Internet based on their required level of service mostly happens at the __________. data link layer routers application layer switches
routers
Which one is used in areas with a lot of electromagnetic interference (EMI)? unshielded twisted pair shielded twisted pair
shielded twisted pair
Bluetooth ranges are intentionally measured in ______________. - hundreds of meters - miles - single and low-double-digit meters - kilometers
single and low-double-digit meters
Which of the following is/are identified by ARP? (3) Errors in packet Size of each address Congestion in network Protocol type Hardware type
size of each address, protocol type, and hardware type
Light travels in a _________ path through substances of uniform density. straight zigzag parabolic bent circular
straight
TCP is a ____________ Transport Layer protocol. unsecured secured
unsecured
Shannon's formula gives the _______ to the capacity of a link. lower bound bandwidth upper bound average limit
upper bound
What is/are the disadvantage(s) of Outdoor License Free Bands? (2) - Engineering surveys are needed - EIRP power limits the range - Must tolerate interference - Recurring costs of lease lines - FCC applications involved
~ EIRP power limits the range ~ Must tolerate interference
Which of the following(s) is/are advantage(s) of LTE CAT M1?(3) - Fast data rates - short air time - TCP/IP network - connect to any server - Less Intellectual Technology Risk(IPR) - Good hardware prices - Can be very power efficient
~ Fast data rates - short air time ~ TCP/IP network - connect to any server ~ Can be very power efficient
Why are there no licenses-free LPWAN systems on the UNII and 5GHz ISM?(3) - Free space loss - Terrible obstacle penetration - Interference - Bands do support long ranges - Noise
~ Free space loss ~ Terrible obstacle penetration ~ Bands do support long ranges
Which of the following polynomial can express 10011001? x7 + x4 + x3 + 1 x6 + x3 + x2 + 1 x7 + x3 + x2 + 1 x5 + x4 + x3 + 0
x7+x4+x3+1
In SONET, 8000 frames are sent per second. This means that the duration of a single STS frame is before it is MUXed with other frames is: (2) - 125 μsecs - 0.125 milliseconds - 125 milliseconds (the equivalent of the blink of an eye) - 125 nanoseconds
~ 125 μsecs ~ 0.125 milliseconds
Which are the following are ISM Bands? (3) - 60, 72 and 80 GHz - 5 GHz - 24 GHz - 900 MHz - 2.4 GHz
~ 5 GHz ~ 24 GHz ~ 2.4 GHz
What are the frequency bands for IEEE 802.11n? (2) - 60GHz - 5GHz UNII Band - 2400MHz - 2483.5MHz - 902MHz - 928MHz - 24GHz
~ 5GHz UNII Band ~ 2400MHz - 2483.5MHz
802.11ad specifies operation on which band? (3) - 24GHz - 60GHz - 2400MHz - 2483.5MHz - 902MHz - 928MHz - 5GHz UNII Band
~ 60GHz ~ 2400MHz - 2483.5MHz ~ 5GHz UNII Band
Which of the following(s) is/are virtually obsolete? (2) - 802.11 - 802.11g - 802.11a - 802.11b
~ 802.11 ~ 802.11b
Which of the following standards are identical except for the radio channels they operate on? (2) - 802.11d - 802.11b - 802.11a - 802.11c - 802.11g
~ 802.11a ~ 802.11g
Which of the following(s) is/are true for MIMO? (2) - Provides 'degree of freedom' gain in a line of sight only environment - Only receivers have multiple antennas - All the antennas TX at the same time - Multiple signal paths can increase the data throughput over traditional SISO systems
~ All the antennas TX at the same time ~ Multiple signal paths can increase the data throughput over traditional SISO systems
What is/are the basic characteristic(s) of LPWAN? (4) - Carrier deployed base stations - Low data rate - Mostly unlicensed spectrum - Must pay a carrier to use their base station infrastructure even on the licensee-free band - Multiple access
~ Carrier deployed base stations ~ Low data rate ~ Mostly unlicensed spectrum ~ Multiple access
Which are the channels that offer no adjacent channel interference in IEEE 802.11g (3) - Channel 9 - Channel 11 - Channel 1 - Channel 4 - Channel 2 - Channel 6
~ Channel 11 ~ Channel 1 ~ Channel 6
What are the benefits of Spread Spectrum Modulation? (4) - Great noise and interference rejection - Allows multiple users to transmit using the same frequency band simultaneously without harmful interference - OFDM supports FEC - Minimizes to eliminates selective frequency fading due to multipath signal cancellation
~ Great noise and interference rejection ~ Allows multiple users to transmit using the same frequency band simultaneously without harmful interference ~ OFDM supports FEC ~ Minimizes to eliminates selective frequency fading due to multipath signal cancellation
A DSL Filter (also called "Splitter"): __________ (can have multiple answers) (2) - Has a low-pass filter to the telephones in the home - Is not needed to isolate the DSL modem from the voice call - Is needed to isolate the DSL modem from the voice calls - Has a hi-pass filter to the telephones in the home - Has bandpass filters in it
~ Has a low-pass filter to the telephones in the home ~ Is needed to isolate the DSL modem from the voice calls
Which of the following(s) is/are license free bands? (2) - Cell bands - PCS bands - ISM Band - The Citizens Broadband Radio Service - 23 GHz band
~ ISM Band ~ The Citizens Broadband Radio Service
Which of the following(s) use(s) OFDMA modulation? (3) - LTE CAT 1 - LTE CAT M1 - LoRaWAN - NB-LTE
~ LTE CAT 1 ~ LTE CAT M1 ~ NB-LTE
Which of the following(s) has/have coverage that is currently available nationwide in the US?(2) - LoRaWAN - Cat - NB1 - Ingenu RPMA - LTE CAT M1 - LTE CAT 1
~ LTE CAT M1 ~ LTE CAT 1
What are the fundamental issues that distinguish wireless networks from wired networks? (2) - Medium - Distance - Bandwidth - Frequency - Mobility
~ Medium ~ Mobility
Which of the following(s) was/were introduced with 802.11ac? (3) - Higher transmit power - Operation on 60 GHz - Multi-User MIMO - 80 and 160 MHz wide channels - 256QAM modulation
~ Multi-User MIMO ~ 80 and 160 MHz wide channels ~ 256QAM modulation
Which of the following(s) is/are advantage(s) of license-free broadband links?(4) - No recurring costs of lease lines - No engineering surveys needed - Can be deployed immediately - No FCC applications involved
~ No recurring costs of lease lines ~ No engineering surveys needed ~ Can be deployed immediately ~ No FCC applications involved
What is/are the considerations for CAT NB1? (3) - Not TCP/IP direct - Monthly subscription - Must implement IPSec - Carrier firmware upgrade pushed out, uses power - No US announcement
~ Not TCP/IP direct ~ Monthly subscription ~ No US announcement
Which of the following(s) is/are characteristic of T-Carrier Lines? (2) - Combination of analog and digital signals - Point-to-point links - Half duplex - Full duplex - Point-to-multipoint links
~ Point-to-point links ~ Full duplex
What are the issues related to wireless communication?(5) - Signal degradation - Interference from other radiators - Limited RF spectrum - Free Space Loss - Multipath cancellations
~ Signal degradation ~ Interference from other radiators ~ Limited RF spectrum ~ Free Space Loss ~ Multipath cancellations
Selective Signal Fading is caused by _________ (2) - OFDM signals used in Wi-Fi - Free Space Loss (FSL) - Specific frequencies arriving out - Co-channel interference - Multipath reflection
~ Specific frequencies arriving out ~ Multipath reflection
Which of the following(s) is/are associated with SONET? (2) - Asynchronous network - Frequency division multiplexing - Synchronous network - Time division multiplexing
~ Synchronous network ~ Time division multiplexing
On a cable system, why are the upload rates so much slower than the available down-load rates from the Head End? (2) - To minimize data errors on the upload - To charge more for the download speed - The upload channels have much less RF bandwidth available then the downstream data channels - The upload channels have more RF bandwidth available then the downstream data channels - The cable company throttles down the up-load speed so as not to clog their networks
~ The upload channels have much less RF bandwidth available then the downstream data channels ~ The cable company throttles down the up-load speed so as not to clog their networks
What are the properties of ATM? (2) - Reliable - Unreliable - Connection oriented - Connectionless
~ Unreliable ~ Connection oriented