MIS 140 - Ch 4, 3, and 6 EXAM 2 MIDTERM
The medium is the physical matter or substance that carries the voice or data transmission. True False
True
The physical and data link layers of wired Ethernet have been refined over the years as a collection of standards under the IEEE 802.3 workgroup. - True - False
True
The predominant method of transferring information internally in a computer is via parallel mode. True False
True
WDM is a version of FDM used in fiber-optic cables. True False
True
In the __________ step of the building-block process to network design, the network designer considers the relative cost of the technologies. -technology design -needs analysis -narrow and deep analysis -cost assessment -distribution layering
cost assessment
ARQ means that: - a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error - the common carrier Automatically Returns Queries to the subscriber upon receipt of such queries - a sender is using a data link protocol called Asynchronous Repeating reQuest - a fiber optic cable meets the American Registered Quality, a certification standard for use in high-quality data communication transmission lines - a sender is using a parity scheme called Array Resource Quality
a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error
____________ refers to the transmission characteristics of the circuit. -handshaking -virtual circuit -bonding -logical circuit -physical circuit
logical circuit
The loss of power a signal suffers as it travels from the transmitting computer to a receiving computer is: - white noise - spiking - attenuation - intermodulation noise - echo
attenuation
The _____________ of a circuit determines a circuit's capacity. frequency -bandwidth -phase -amplitude -loudness
bandwidth
Gaining an understanding of the current application system and messages provides a _________ against which future design requirements can be gauged. -backplane -baseline -turnpike document -wish list -RFP
baseline
Errors on a network can occur: - only on dial-up type of circuits - because of noise on the line - only on poorly maintained networks - only due to Gaussian noise - only due to lightning strikes
because of the noise on the line
Which type of digital signaling would experience fewer errors because it has more distinct signals? -unipolar -serial -bipolar -attenuation -Huffman encoding signal
bipolar
A circuit that is filled almost to its capacity and thus is the critical point that determines whether users get good or bad response times is referred to as a(n) -bottleneck -building backbone -breakneck -congested network -e-commerce edge
bottleneck
The network architecture component that is sometimes referred to as the distribution layer is the -LAN -building backbone -campus backbone -enterprise edge
building backbone
__________ is a line-of-sight type of wireless media. -coaxial cable -microwave -radio -twisted pair -fiber optic
microwave
The acronym, Modem, stands for _________________. -multiplexing/demultiplexing -more/demote -Mode-M technique -modulator/demodulator -Mod emulation technique
modular/demodulator
____________ refers to changing the shape of the sound wave in different ways to represent a 1 or a 0. -digitizing. -sampling -modulation -demodulation -shaping
modulation
Estimating the cost of a network is ______ complex than estimating the cost of one new piece of data processing hardware. -much more -much less -about the same -exactly the same -a little more
much more
Frequency division multiplexing: -operates by statistically time slicing the signal -operates by dividing the signal into different frequencies -uses a codec that divides signals into different channels -operates by time slicing the signal -operates by light dividing the signal
operates by dividing the signal into different frequencies
Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals? -phase -attenuation -bipolar -bandwidth -codec
phase
Estimating the size and type of the "standard" and "advanced" network circuits is called _________. -needs categorization -turnpike design -cost assessment -capacity planning
capacity planning
With contention: - computers wait until the circuit is free before they send data - the server or front end processor works consecutively through a list of clients to determine who should have access to the media - the front end processor must wait for a response from the polled client or terminal - one computer starts the poll and passes it to the next computer on the multipoint circuit - there is never a chance for "collision," or two computers trying to send data at the same time
computers wait until the circuit is free before they send data
With __________ ARQ, the sender immediately sends the next message or packet of data. - continuous - immediate - open window - stop-and-wait - halt and be recognized (HBR)
continuous
In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins? -bandwidth modulation -amplitude modulation -frequency modulation -phase modulation
phase modulation
Another term for impulse noise is: - Gaussian noise - spikes - attenuation - cross-talk - intermodulation noise
spikes
When sending four bits at a time using frequency modulation, the number of different frequency levels that would be needed would be _______. -24 -16 -8 -4
16
The probability of detecting an error, given that one has occurred, using parity checking is about: - 100% - 0% - 50% - 75% - 98%
50%
How many bits are required to sample an incoming signal 4000 times per second using 64 different amplitude levels? -32 -16 -8 -6
6
If the highest frequency of a circuit is 10KHZ and the lowest frequency is 900 Hz, the bandwidth available for this circuit is : -890 Hz -8900 HZ -9100 Hz -9Khz -890 KHz
9100 Hz
___________ refers to the amount of data transmitted on a circuit. -Circuit loading -Leading edge deployment -Capacity planning -Calculating message volumes -Requirements documentation
Circuit loading
Another term for stop-and-wait ARQ is sliding window. - True - False
False
Digital transmission produces more errors than analog transmission. True False
False
Fiber optic cable carries signals in traditional electrical form. True False
False
Guided media refers to the type of media in which the message is broadcast through the air. True False
False
Impulse noise is caused by the thermal agitation of electrons. - True - False
False
In a multipoint circuit configuration, each computer can use the circuit at the same time. True False
False
In a multipoint circuit configuration, each computer has a dedicated circuit between itself and each of the other computers in the network. True False
False
Multimode fiber is capable of longer transmission distances than single mode fiber. True False
False
Multiplexing increases the cost of provisioning network circuits. True False
False
Needs analysis is the final step in the building block approach to network design. True False
False
Parity checking can only detect an error when an even number of bits are switched. - True - False
False
Serial mode transmission is much faster than parallel mode transmission. True False
False
The turnpike effect results when a network is used at a much lower rate than was anticipated when it was designed. True False
False
With modem communications, the receiving modem converts the incoming digital signal from the telephone line into an analog signal that can be understood by the computer. True False
False
A traditional network design approach follows a structured systems analysis and design process similar to that used in building applications. True False
True
Amplitude, frequency and phase are all characteristics of a sound wave. True False
True
Attenuation refers to the loss of signal strength. - True - False
True
Computers produce digital data whose values are binary: 0 or 1. True False
True
Cyclical redundancy check is one of the most popular polynomial error-checking schemes True False
True
Data compression can increase the throughput of a communication link. True False
True
Digital transmission permits higher maximum transmission rates when compared to analog. True False
True
Forward error correction is commonly used in satellite transmission. True False
True
HDLC is very similar to the SDLC synchronous data link protocol. - True - False
True
If a computer transmits a message containing "ABC" and the destination computer receives "abc" as the message, the message is corrupted. - True - False
True
In full-duplex transmission, two stations can send and receive simultaneously. True False
True
The "local loop" refers to the wires that run from the customer premises to the telephone switch of the telephone company. True False
True
The campus backbone is usually faster than the backbones used inside buildings. True False
True
-------CH 3--------
--------CH 3----------
------CH 6---------
-------CH 6--------
------CH 4------
-----CH 4------
-----PRACTICE TEST 2------ (avoiding repeats)
-----PRACTICE TEST 2------ (avoiding repeats)
A coding scheme that uses 10 bits to represent each character is capable of representing _________ different characters. -256 -20 -200 -512 -1024
1024
The typical range of human hearing is: 0 to 4,000 Hz 0 to 1,200 Hz 20 to 14,000 Hz 0 to 300 Hz 0 to 56,000 Hz
20 to 14,000 Hz
Which of the following would not be a type of circuit that needs to be considered when planning for technology design capacity? -1000 Mbps -Ethernet -10 Mbps -100 Mbps -1 Gbps
Ethernet
____________ refers to bits that have been changed, in error, from 1 to 0, or vice versa, in a data transmission. - Contracted bits - Polled bits - Inverse multiplexed bits - Flipped bits - Bit delineation
Flipped bits
_____________ can be thought of as dividing the circuit horizontally. -Statistical frequency division multiplexing -Wavelength division multiplexing -Time division multiplexing -Frequency division multiplexing
Frequency division multiplexing
__________ controls errors by detecting and correction them at the receiving end without retransmission of the original message - Hamming code - Huffman encoding - Front end processing - Wave division multiplexing - Hub polling
Hamming code
__________can obliterate a group of bits, causing a burst error. - Cross-talk - Attenuation - Impulse noise - Intermodulation noise - White noise
Impulse noise
Which of the following is true with respect to the data link layer? -It accepts streams of bits from the application layer. -It is responsible for encoding the bit-stream as a series of electronic voltages -It performs error detection. -It performs routing functions.
It performs error detection.
______________ refers to the time it takes for a signal to travel from sender to recipient (highly exaggerated with satellite transmission). -Line-of-sight effect -Multimode index -Saturation effect -Raindrop attenuation -Propagation delay
Propagation delay
RFP stands for: -Request for Proposal -Ring Fault Path -Routing File Protocol -Record Facsimile Program -Redundant File Protocol
Request for Proposal
________ is used to model the behavior of the planned communication network once the proposed network map is complete. -Implementation -Post-implementation review -Documentation -Simulation -Training users
Simulation
One way to reduce quantizing errors is to increase the sampling rate of the analog signal. True False
True
Overhead bits are used for error checking and marking the start and end of characters and packets. - True - False
True
Radio data transmission requires that each device has a radio receiver/transmitter and uses a specific frequency. True False
True
Which of the following is not a type of synchronous protocol? - SDLC - VT100 - HDLC - Ethernet - PPP
VT100
Using parity, the probability for detecting an error, given that one has occurred, is: - about 50% for either even or odd parity - about 70% for even parity and 30% for odd parity - about 30% for even parity and 70% for odd parity - about 0% for either even or odd parity - about 100% for either even or odd parity
about 50% for either even or odd parity
Which of the following are not costs that are generally considered during the cost assessment stage of the building-block network design process? -cost of advertising brochures for new products to be offered by an organization -internetworking devices cost -network management costs -circuit costs -software costs for network operating system
cost of advertising brochures for new products to be offered by an organization
With the two-tier client-server architecture, the server is responsible for the ________ logic. -application -presentation -data access -session
data access
Transmission speeds: -are the same among all media -are not a factor in selecting a media because all media have more than enough speed to serve current communication demands -are a constant, 56Kbps, for all media types -differ widely among media -always have a direct correlation with security
differ widely among media
The network architecture component that is a special LAN with a group of servers that enables electronic data exchange of between the organization and the external entities it does business with is called the -LAN -building backbone -data center -enterprise edge -e-commerce edge
e-commerce edge
Asynchronous transmission: - is used to transmit each character simultaneously with all other characters - has a pre-determined, fixed time between sending characters - is typically used on multipoint half duplex circuits - uses a continuous series of start bits as an idle signal - each character is transmitted independently of all other characters
each character is transmitted independently of all other characters
When a signal is reflected back to the transmitting equipment, it is called a(n) _________. - white noise - echo - crosstalk - attenuation - impulse noise
echo
Which of the following media has the lowest error rates and the highest transmission speeds? -Coaxial cable -unshielded twisted pair -shielded twisted pair -fiber optic cable -infrared
fiber optic cable
Which of the following is a way to sell the network proposal to management? -talk about upgrades from 10Mbps to 100Mbps -give many details about using routers vs. gateways for a particular connection -concentrate on a discussion about token ring vs. Ethernet protocol -focus on the growth in network use -discuss SNA architecture
focus on the growth in network use
Having a conversation with someone using a cellular phone is an example of _________ transmission. -simplex -full-duplex -half-duplex -digital
full-duplex
To get more "bandwidth" in a digital transmission, you must: -increase the range of frequencies available for a transmission -increase the loudness per transmission -decrease the bits per second transmission speed -increase the phase shifts per transmission -decrease the baud rate per transmission
increase the range of frequencies available for a transmission
In communication protocols, _________ are used to convey the user's meaning - information bits -overhead bits -stop bits -start bits -flag bits
information bits
Media access control: - is not very important in point-to-point with full duplex configuration - is not very important in local area networks - is not very important in a point-to-point with a half duplex configuration - is not very important in a multipoint configuration - does not control when computers transmit
is not a very important in point-to-point with full duplex configuration
Synchronous transmission: - cannot be used on multipoint circuits - is used to send one character at a time - uses start bits before each character to be sent - uses stop bits after each character to be sent - is used to transmit a "frame" or "packet" of data at a time
is used to transmit a "frame" or "packet" of data at a time
Which of the following is not a key deliverable for the cost assessment step of the building-block network design process? -RFP -list of wish list requirements -revised physical network diagram -business case, defined in business objectives and business language, that supports the network design -none of the above is an appropriate choice
list of wish list requirements
Time (non-statistical) division multiplexing differs from frequency division multiplexing because it: -does not share a communication circuit -splits the communication circuit vertically (with time slots) instead of horizontally -increases the wavelength and phase angles of the baseband frequency used for transmission -moves the baseband of a circuit by shifting it to a higher frequency -reduces baseband signal velocity more than frequency division multiplexing
splits the communication circuit vertically (with time slots) instead of horizontally
In the technology design stage of network design, -the fundamental technology/protocols to be chosen have no relationship with the circuit capacity -the decision for fundamental technology/protocols can be made without considering circuit capacity -the decision for circuit capacity can be made without considering fundamental technology/protocols -the decisions for fundamental technology/protocols and circuit capacity are interrelated
the decisions for fundamental technology/protocols and circuit capacity are interrelated
In needs analysis: -the costs of different physical network design alternatives are assessed -the goal is to understand what users and applications the network will support -the geographic scope is not an important consideration -a baseline of current operations is not important -the rate of growth of network traffic is not an issue
the goal is to understand what users and applications the network will support
The type of media usually installed on homes and businesses by the telephone company is called ____________. -fiber optic cable -coaxial cable -twisted pair -phone cable -phone wire
twisted pair
In general, controlled approaches: - work better than contention approaches for small networks that have low usage - work better than contention approaches for large networks that have high usage - work better than contention approaches for all sizes of networks - do not require a host, server, or active monitor to assign media access control - have many collisions
work better than contention approaches for large networks that have high usage
