Quiz Week 4
There is an access point that serves eight wireless hosts. On how many channels will these devices transmit during the course of an hour or two?
1
Cat 5e and Cat 6 wiring can carry Ethernet traffic 100 meters up to ________.
1 Gbps
Near-field communication has a maximum transmission distance of about ________.
4 cm / 2 in
In the UTP wiring used in LANs, how many wire pairs are there in a cord?
4.
Data grade UTP cable usually contains:
8 wires
For wireless backup, which of the following is adequate?
802.11ac
Which of the following brings gigabit speeds to clients?
802.11ac
Which light wavelength dominates use in LAN fiber?
850 nm.
Which light wavelength is the least expensive in optical fiber?
850 nm.
For ADSL service, which of the following must be added to the telephone system?
A DSLAM
For ADSL service, which of the following must be added to the telephone system?
A DSLAM.
signal
A ________ is a disturbance that propagates down a transmission medium to the other side, which reads it.
noise
A high signal-to-noise ratio reduces ________ errors.
cord
A length of UTP wiring is a ________.
aggregate throughput
A multiplexed line's throughput is ________.
the speed it should provide
A network's rated speed is ________.
a brief large increase or decrease in the noise energy
A noise spike is ________.
A length of UTP wiring is a ________. A) cord B) fiber C) strand D) run
A) cord
Parallel transmission is transmission over ________. A) two or more wire pairs B) 4 wire pairs
A) two or more wire pairs
False.
ADSL offers symmetric service.
False
Analog signaling is relatively immune to small errors.
Physical layer standards govern ________. A) frame structure B) signaling C) Both A and B D) Neither A nor B
B) signaling
Which of the following is relatively immune to small errors?
Binary signaling
What propagation problem becomes worse as frequency increases?
Both Absorptive attenuation and Shadow zones
Which of the following is more efficient?
CSMA/CA+ACK.
In the UTP wiring used in LANs, how many wire pairs are there in a cord? A) 2 B) 8 C) 1 D) 4
D) 4
When a WLAN is in use, the distribution system is the ________.
Ethernet network
Analog signaling is relatively immune to small errors.
False
Hubs operate at Layer 2.
False
False
Hardware base prices usually give an accurate indication of the actual cost of using the hardware.
In which of the following is speed shared?
Hubs
Both A and B -- splitters and an ADSL modem
In ADSL, the customer needs ________.
false
In LANs, UTP typically is used for trunk lines.
a few
In digital signaling there is (are) ________ state(s).
8
In the UTP wiring used in LANs, how many wires are there in a cord?
multimode fiber
LANs normally use ________.
pure hub-and-spoke networks
Low cost is an advantage of ________.
Ethernet addresses were formerly called ________ addresses.
MAC
multimode fiber quality
Modal bandwidth is a measure of ________.
modal dispersion
Multimode fiber distance is limited primarily by ________.
An 8/1 increase in power corresponds to approximately ________ decibels.
None of these
In Bluetooth, a master can have up to ________ slaves at any moment.
None of these
To connect to an access point, you must know its ________.
None of these
Wireless network standards come from ________.
OSI
What transmission medium do ALL DSL services use?
One-pair voice-grade UTP.
False
Operations is setting up service.
True
Operations manages the network on a second-by-second basis.
two or more wire pairs
Parallel transmission is transmission over ________.
None of the above -- sensitivity analysis, GIGO analysis, validation, what-is analysis
Performing an in-depth inventory of the current state of the company's network is called ________.
Ethernet has multiple _____ to interface with.
Physical layer standards
In Ethernet, synchronization is provided by the _____.
Preamble
WPS is applicable to ________.
Preshared key mode
latency-intolerant, latency-tolerant
Priority is assigning high priority to ________ applications while giving low priority to ________ applications.
True
Priority is more labor-intensive than overprovisioning.
False
Priority restricts traffic entering the network at access points.
True
Propagation effects can make a signal unreadable at the destination.
provisioning
Providing service is called ________.
True
Provisioning is setting up service.
False
QOS guarantees help traffic even if the traffic is not given specific QoS guarantees.
metrics
QoS is quantified through ________.
In ________, when a wireless host wishes to send, it first sends a message to the wireless access point asking for permission to send. When the access point sends back a response, the host sending the original message may transmit. All other hosts must wait.
RTS/CTS
full mesh leased line networks
Reliability is an advantage of ________.
Both A and B -- a user changes jobs within the firm and a user joins a project team
Reprovisioning may be necessary when ________.
False
Reprovisioning may be necessary when a user leaves the company entirely.
A popular type of optical fiber connector is ________.
SC
True
SNMP Get commands ask agents for information about the managed device.
Only B and C -- reroute traffic and temporarily turn off expensive transmission links
SNMP Set commands can ________.
Serial transmission is transmission over a single wire pair.
TRUE
The general name for a company that is given rights of way to lay wires through public areas is carrier.
TRUE
At the beginning of a telephone call placed through a Bluetooth headset with the Hands-Free Profile, which device is initially the master?
The Bluetooth headset.
True
The Ethernet standard limits UTP propagation distances to 100 meters at all speeds up to 1 Gbps.
False
The Public Switched Telephone Network is designed to be available 90% of the time.
in the MIB
The SNMP manager stores the information it receives from Get commands ________.
Who created WPA?
The Wi-Fi Alliance
full-duplex communication
The ability to transmit in two directions simultaneously is ________.
False
The percentage of bits that are lost or damaged during delivery is called the packet error rate.
packet error rate
The percentage of packets that are lost or damaged during delivery is called the ________.
deals with propagation effects
The physical layer ________.
In 4-pair UTP, what is twisted?
The wires in each pair are twisted around each other
the speed a network actually provides to users
Throughput is ________.
false
Throughput is a network's rated speed.
Ethernet MAC layer addresses are also called physical addresses.
True
For their transmission medium, cable television companies primarily use coaxial cable.
True
Binary signaling is relatively immune to small errors.
True.
modal dispersion
When the light energies of multiple pulses overlap, this is ________.
Cat 6A.
Which form of UTP can carry 10 Gbps signals 100 meters?
850 nm.
Which light wavelength dominates use in LAN fiber?
1-pair VG UTP.
Which of the following already runs to nearly all customer premises?
both mesh and hierachy
Which of the following can be used in a complex topology?
bps, kbps, Mbps, Gbps
Which of the following correctly orders transmission speeds from smallest to largest?
Network Demand
Which of the following is growing more rapidly?
The Public Switched Telephone Network.
Which of the following usually has higher availability?
Single mode fiber distance is limited primarily by ________.
absorptive attenuation
When a signal grows weaker as it travels, this is called ________. (Choose the most specific answer.)
attenuation
In optical fiber, light travels through the ________.
core
When one pair in a UTP cord interferes with signals in other pairs, this is ________.
crosstalk interference
EMI between pairs in a single UTP cord creates a condition known as:
crosstalk.
Two-way amplifiers are needed for cable ________ service.
data
The physical layer ________.
deals with propagation effects
Wider channel bandwidth ________.
decreases transmission speed
A notebook computer configured to act like a real access point is a(n) ________.
evil twin access point
Wireless radio transmission usually is expressed in terms of ________.
frequency
The ability to transmit in two directions simultaneously is ________.
full-duplex communication
The frequency range from 500 megahertz to 10 gigahertz is called the ________.
golden zone
MIMO ________.
increases throughput
In 802.11 networks, the speed I receive on my portable devices is a(n) ________.
individual throughput
CSMA/CA+ACK is ________.
inefficient
In UTP cables, each wire is surrounded by ________.
insulation
When a fluorescent light interferes with UTP transmission, this is ________.
interference
Changes in a signal during propagation are called, most generally, ________.
interference effects
The residential local loop consists of ________ transmission lines.
one-pair voice-grade UTP
Mesh networking in 802.11 is likely to use ________.
only wireless devices
A ________ is a disturbance that propagates down a transmission medium to the other side, which reads it.
signal
The main benefit of parallel transmission over serial transmission is ________.
speed
Signals usually ________.
spread over a range of frequencies
A channel has more bandwidth than is necessary given data transmission speeds requirements in ________ transmission.
spread spectrum
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________.
terminal crosstalk interference
Today, the main benefit of optical fiber compared with UTP is ________.
the ability to span greater distances
Wireless network standards operate at ________.
the data link layer
In unlicensed bands, ________.
you can use radios wherever you please
Which of the following already runs to nearly all customer premises?
1-pair VG UTP.
10,000 bps
10 kbps is ________.
In most versions of Ethernet, what is the maximum cord length allowed by the standard?
100 meters
The 5 GHz band supports about ________ nonoverlapping 20 MHz channel(s).
12
Which light wavelength propagates farthest in optical fiber?
1550 nm
Which light wavelength propagates farthest in optical fiber?
1550 nm.
A wireless host sends a packet to a server on the company's wired Ethernet LAN via an access point. How many frames will be involved in this one-way transmission?
2
For full-duplex transmission, optical fiber normally uses ________.
2 strands
Bluetooth uses the ________ service band.
2.4 GHz
Which unlicensed band is defined the same way in most countries around the world?
2.4 GHz.
Which unlicensed band provides greater propagation distance for a given level of power?
2.4 GHz.
A 100/1 increase in power corresponds to approximately ________ decibels
20
In 802.11i PSK mode, the pass phrase should be at least ________ characters long.
20
In 802.11, channel bandwidth usually is ________.
20 MHz
A typical speed for NFC is about ________.
200 kbp
2 mW represents a dBm value of about ________.
3
The 2.4 GHz band supports ________ nonoverlapping 20 MHz channel(s).
3
1 Watt represents a dBm value of about ________.
30
Which of the following already runs to nearly all customer premises?
4-pair UTP
Which transmission medium is dominant for the wired access line between a host and the switch that serves the host?
4-pair UTP
Which transmission medium is dominant for the wired access line between a host and the switch that serves the host?
4-pair UTP.
47 Mbps
47,000,000 bps is ________.
In the 5 GHz band, how many channels can you have with 802.11ac with 80 GHz channels?
6
A typical optical fiber core size is ________.
62.5 microns
What is a typical core diameter for multimode fiber?
62.5 microns.
Which light wavelength dominates use in LAN fiber?
62.5 nm
In the UTP wiring used in LANs, how many wires are there in a cord?
8
In the UTP wiring used in LANs, how many wires are there?
8
Single mode fiber has a core diameter of ________.
8.3 microns
I wish to have a wireless LAN to serve my house. I will use ________.
802.11
Which of the following can use access points?
802.11
Wireless LAN standards are created by the ________ Working Group.
802.11
If an 802.11n access point and an 802.11g client communicate, they communicate using ________.
802.11g
Which of the following uses OFDM?
802.11g
802.1X needs security between the authenticator and the computer in ________.
802.11i
What is the strongest security protocol for 802.11 today?
802.11i
802.11i is attractive compared with WPA because ________.
802.11i offers stronger security
The 802.11 standard for mesh networking is ________.
802.11m
For which of the following is 100 meters a typical service distance?
802.11n
For which standard is 300 Mbps a typical rated speed?
802.11n
The standard for roaming among access points is ________.
802.11r
In what mode of 802.11i operation is a central authentication server used?
802.1X mode
The Ethernet Standards are also known as the _______ standards.
802.3
QoS reserved capacity
A packet will definitely get through if it has ________.
Neither A nor B -- SC nor RJ-45
A popular type of optical fiber connector is ________.
Both A and B -- is too expensive at higher traffic volumes and is unable to grow to meet higher traffic volume
A solution fails to be scalable if it ________.
62.5 microns
A typical optical fiber core size is ________.
Cat 5e and Cat 6 wiring can carry Ethernet traffic 100 meters up to ________. A) 1 Gbps B) 100 Mbps C) 10 Gbps D) 10 Mbps
A) 1 Gbps
For full-duplex transmission, optical fiber normally uses ________. A) 2 strands B) 8 strands C) 4 strands D) 1 strand
A) 2 strands
What type of switch connects users to the network? A) Access switches. B) User switches. C) Core switches. D) None of the above
A) Access switches.
A network that runs on the customer premises is a ________. A) LAN B) WAN C) Both A and B D) Neither A nor B
A) LAN
In digital signaling there is (are) ________ state(s). A) a few B) one C) an infinite number of D) two
A) a few
Companies must use carriers for WAN transmission because ________. A) companies lack rights of way B) carriers have extremely strong security C) Both A and B D) Neither A nor B
A) companies lack rights of way
In optical fiber, light travels through the ________. A) core B) cladding C) Neither A nor B
A) core
The ability to transmit in two directions simultaneously is ________. A) full-duplex communication B) parallel communication C) Both A and B D) Neither A nor B
A) full-duplex communication
Ethernet standards govern the ________ layer. A) physical B) internet C) Both A and B D) Neither A nor B
A) physical
UTP categories rate the ________ of cabling. A) quality B) quality-of-service performance C) cost D) error performance
A) quality
The Wi-Fi Alliance refers to 802.1X mode as ________ mode.
AES
802.11i uses ________ as its encryption method.
AES-CCMP
How long does it take an attacker to crack WEP today with readily available software?
About ten seconds.
What propagation problem becomes worse as frequency increases?
Absorptive attenuation.
True
After performing what-is analysis, it is generally a good idea to perform gaps analysis.
maximum latency
An SLA for latency should specify a ________.
minimum availability
An SLA for latency should specify a ________.
worst case
An SLA should specify the ________.
Which of the following is usually set up by a hacker outside the building?
An evil twin access point.
True
As a signal propagates down a UTP cord, greater propagation distance will result in more noise errors, even if the noise level is constant.
True
Availability is the percentage of time that a network is available for use.
What 802 Working Group creates Ethernet standards? A) 802.e. B) 802.3. C) 802.1. D) 802.11.
B) 802.3.
Which of the following is relatively immune to small errors? A) Analog signaling. B) Binary signaling. C) Both A and B D) Neither A nor B
B) Binary signaling.
Which UTP quality levels are needed to send signals 100 meters at 10 gigabits per second? A) Category 6. B) Category 6A. C) Both A and B D) Neither A nor B
B) Category 6A.
A ________ serves a city and its suburbs. A) PAN B) MAN C) Both A and B D) Neither A nor B
B) MAN
What type of interference is most frequently a problem? A) Crosstalk interference. B) Terminal crosstalk interference. C) Noise interference. D) Electromagnetic interference.
B) Terminal crosstalk interference.
Multimode fiber distance is limited primarily by ________. A) absorptive attenuation B) modal dispersion C) Both A and B about equally
B) modal dispersion
Modal dispersion limits transmission distance in ________. A) single-mode fiber B) multimode fiber C) Both A and B D) Neither A nor B
B) multimode fiber
A LAN is a network that ________. A) links different sites together B) provides service within a site C) provides international service D) All of the above
B) provides service within a site
A ________ is a disturbance that propagates down a transmission medium to the other side, which reads it. A) bit B) signal C) byte D) kilobyte
B) signal
Four-pair UTP uses ________ connectors. A) binary B) snap C) ST or SC D) None of the above
B) snap
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________. A) attenuation B) terminal crosstalk interference C) interference D) crosstalk interference
B) terminal crosstalk interference
In LANs, optical fiber typically is used in ________. A) access lines B) trunk lines C) Both A and B D) Neither A nor B
B) trunk lines
An access point and the set of hosts it serves is called a(n) ________.
BSS
The ________ is the identifier in a basic service set.
BSSID
True
Binary signaling is relatively immune to small errors.
Which of the following is relatively immune to small errors?
Binary signaling.
Bluetooth is standardized by the ________.
Bluetooth Special Interest Group
802.11 standards are being developed to work in the ________ unlicensed band.
Both 2.4 GHz and 5 GHz
Which of the following was created for PANs?
Both 802.11 and Bluetooth
Which of the following can operate in the 5 GHz band?
Both 802.11g and 802.11ac
Which of the following uses OFDM?
Both 802.11g and 802.11n
In 4-pair UTP, what is twisted?
Both All of the wires are twisted around one another and The wires in each pair are twisted around each other
Which of the following can be used to centrally manage remote access points?
Both Smart access points and WLAN switches
When a host moves from one wireless access point to another in a WLAN, this is ________.
Both a handoff and roaming
Media access control governs transmission by ________.
Both access points and wireless hosts
Managed access points should ________.
Both allow access point power to be adjusted remotely and provide constant transmission quality monitoring
An extended service set (ESS) is a group of BSSs that ________.
Both are connected to the same distribution system and have the same SSID
In Ethernet, limiting UTP cord runs to 100 meters normally limits ________ to an acceptable level.
Both attenuation and noise errors
Beamforming can allow an access point to ________.
Both direct power to individual clients and send signals to two different clients at the same time
A denial-of-service attack against a wireless network can be implemented by ________.
Both flooding the network with traffic and sending disassociate commands to clients
A mobile phone may communicate a headset using the Bluetooth ________ profile.
Both hands-free and headset
Managed access points should ________.
Both identify rogue access points and be able to push updates out to access points
Twisting wires reduces ________.
Both interference and crosstalk interference
In ADSL, the customer needs ________.
Both splitters and an ADSL modem
bus
Broadcasting is used in the ________ topology.
Neither A nor B -- buying fiber with lower modal bandwidth nor buying fiber with wider core diameter
Businesses can select multimode fiber to transmit 1000BASE-SX signals farther by ________.
Ethernet standards govern the ________ layer. A) physical B) data link C) Both A and B D) Neither A nor B
C) Both A and B
In Ethernet, limiting UTP cord runs to 100 meters normally limits ________ to an acceptable level. A) noise errors B) attenuation C) Both A and B D) Neither A nor B
C) Both A and B
The main benefit of parallel transmission over serial transmission is ________. A) reliability B) speed C) Both A and B D) Neither A nor B
C) Both A and B
Which UTP quality levels can send signals at 10 gigabits per second? A) Category 6A. B) Category 6. C) Both A and B D) Neither A nor B
C) Both A and B
What form of transmission is most resistant to transmission errors? A) Digital. B) Binary. C) Both are about equally resistant to transmission errors.
C) Both are about equally resistant to transmission errors.
What type switch connects switches to other switches? A) Trunk switches. B) Workgroup switches. C) Core switches. D) None of the above
C) Core switches.
Modal bandwidth is a measure of ________. A) propagation speed B) multimode fiber quality C) fiber quality D) modal dispersion
C) fiber quality
A WAN is a network that ________. A) provides service within a site B) provides service within about a mile C) links different sites together D) All of the above
C) links different sites together
When the light energies of two pulses arrive at overlapping times, this is ________. A) multimode transmission B) modal dispersion C) modal bandwidth D) modal interference
C) modal dispersion
Which of the following is usually optional in access point operation?
CSMA/CA+ACK
True
Carrier costs are a factor in the systems life cycle.
SLC
Carrier costs occur during the ________.
1 Gbps
Cat 5e and Cat 6 wiring can carry Ethernet traffic 100 meters up to ________.
Which form of UTP can carry 10 Gbps signals 100 meters?
Cat 6A
Which of the following UTP wiring quality standards governs many UTP cables for sale today?
Category 6
propagation effects
Changes in a signal during propagation are called, most generally, ________.
Which form of Bluetooth has a typical transmission speed of about 3 Mbps?
Classic Bluetooth.
False
Companies should measure error rates when traffic levels are low in order to have a good understanding of error rate risks.
more
Compared with UTP, optical fiber is ________ expensive to buy and install today.
a wider
Compared with single-mode fiber, multimode fiber has ________ core.
In optical fiber, light travels through the _____.
Core
In the UTP wiring used in LANs, how many wires are there in a cord? A) 8 B) 1 C) 2 D) 4
D) 8
What organization creates Ethernet standards? A) ISO. B) OSI. C) IETF. D) IEEE.
D) IEEE.
Ethernet standards govern the ________ layer. A) internet B) transport C) Both A and B D) Neither A nor B
D) Neither A nor B
LAN speeds are faster than WAN speeds. This is because of ________. A) the slow corporate adoption of newer WAN technologies B) technological limitations C) regulatory limitations D) economic reasons
D) economic reasons
52) Optical fiber cords use two strands ________. A) to double the transmission speed B) to form a complete electrical loop C) for reliability through redundancy D) for full-duplex communication
D) for full-duplex communication
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________. A) attenuation B) interference C) crosstalk interference D) terminal crosstalk interference
D) terminal crosstalk interference
In binary signaling there is (are) ________ state(s). A) one B) a few C) an infinite number of D) two
D) two
a user leaves the company entirely
Deprovisioning may be necessary when ________.
False
Downtime is the percentage of time that a network is available for use.
UTP wires are normally twisted together to reduce the occurrence of:
EMI
802.11 is the Working Group that creates Ethernet standards.
FALSE
Analog signaling is relatively immune to small errors.
FALSE
In LANs, UTP typically is used for trunk lines.
FALSE
In LANs, workgroup switches must be able to carry more traffic than core switches.
FALSE
The ability to transmit in two directions simultaneously is called parallel transmission.
FALSE
ADSL offers symmetric service.
False
H2-BC-66-0D-5E-BA is a valid MAC address.
False
If there is a PAD field, it will be added by the receiver.
False
In LANs, UTP typically is used for trunk lines.
False
Multimode fiber allows signals to travel for longer distances than single-mode fiber does.
False
NICs read the bits sent by the hub and determine whether to read or discard the frame based upon the source address contained in the frame.
False
Serial transmission is usually faster than parallel data transmission.
False
The ability to transmit in two directions simultaneously is called parallel transmission.
False
core switches use control frames to decide where to send a frame.
False
The ability to transmit in two directions simultaneously is called parallel transmission
False.
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends completely eliminates terminal crosstalk interference.
False.
False
Firms generally make their own routers and switches, rather than purchasing them.
A DSLAM.
For ADSL service, which of the following must be added to the telephone system?
2 strands
For full-duplex transmission, optical fiber normally uses ________.
coaxial cable
For their transmission medium, cable television companies primarily use ________.
true
For their transmission medium, cable television companies primarily use coaxial cable.
_____ is measured in hertz.
Frequency
Classic Bluetooth uses ________.
Frequency Hopping Spread Spectrum
The ability to transmit in two directions simultaneously is _____.
Full duplex communication
Which form of Bluetooth has a typical transmission speed of about 24 Mbps?
High-Speed Bluetooth.
Which Bluetooth profile would a tablet use with a Bluetooth keyboard?
Human interface device profile
True
If a carrier does not meet its SLA guarantees, it generally must pay a penalty to its customers.
True
If a product fails to meet minimum requirements, it should be dropped from consideration.
The wires in each pair are twisted around each other.
In 4-pair UTP, what is twisted?
an ADSL modem
In ADSL, the residential customer needs ________.
Both A and B -- attenuation and noise errors
In Ethernet, limiting UTP cord runs to 100 meters normally limits ________ to an acceptable level.
trunk lines
In LANs, optical fiber typically is used in ________.
Service
In QoS, the S stands for ________.
False
In SNMP, the manager communicates directly with a managed device.
agent
In SNMP, the manager communicates directly with a(n) ________.
insulation
In UTP cables, each wire is surrounded by ________.
two
In binary signaling there is (are) ________ state(s).
true
In cable television, the drop cable runs from the trunk cable into the home.
Neither A nor B -- run side-by-side nor are twisted around each other
In cable television, the two conductors ________.
100 meters.
In most versions of Ethernet, what is the maximum cord length allowed by the standard?
Neither A nor B - 50 or 850 microns
In optical fiber, a typical wavelength is ________.
core
In optical fiber, light travels through the ________.
wavelength
In optical fiber, we measure light in terms of ________.
trunk cable
In television, the ________ carries signals past the subscriber's house.
4
In the UTP wiring used in LANs, how many wire pairs are there in a cord?
mesh
In the ________ topology, there are many possible paths between two end nodes.
none of the above -- It is point-to-point
In the ________ topology, there are only two nodes.
hierarchical
In the ________ topology, there is only a single possible path between two end nodes.
What is unique about the Physical Layer?
It is the only layer where encapsulation does NOT occur.
Both voice over IP and streaming media
Jitter is a problem for ________.
streaming media
Jitter is a problem for ________.
A company has more control over its ________ technology.
LAN
milliseconds (ms)
Latency is usually measured in ________.
Which form of Bluetooth has a typical transmission speed of about 200 kbps?
Low-Energy Bluetooth
two-pair data-grade UTP
Low-speed leased lines use ________ transmission lines.
Why is multimode fiber used instead of single-mode fiber for local area networks (LAN) transmission?
Lower Cost
Why is multimode fiber used instead of single-mode fiber for LAN transmission?
Lower cost.
is the least inexpensive
Lower-wavelength light dominates in optical fiber because it ________.
________ is a technique for preventing two wireless stations from transmitting at the same time and therefore interfering with each other.
Media access control
multimode fiber
Modal dispersion limits transmission distance in ________.
Neither A nor B -- full mesh leased line networks, pure hub-and-spoke networks
Most corporate leased line networks are ________.
True.
Multimode optical fiber quality is measured as MHz.km.
In which frequency band can NFC operate?
Neither 2.4 GHz. nor 5 GHz.
In optical fiber, a typical wavelength is ________.
Neither 50 microns nor 850 microns
Which of the following is a full, according to the book?
Neither 802.11ac nor 802.11ad
Which of the following is a draft standard, according to the book?
Neither 802.11g nor 802.11n
Businesses can select multimode fiber to transmit 1000BASE-SX signals farther by
Neither A nor B
In cable television, the two conductors ________.
Neither A nor B
________ is a major propagation problem in optical fiber.
Neither A nor B
What propagation problem becomes worse as frequency increases?
Neither Inverse square law attenuation nor Electromagnetic interference
________ is a major propagation problem in optical fiber.
Neither Noise nor Interference
A popular type of optical fiber connector is ________.
Neither SC nor RJ-45
Two wireless devices communicate via Wi-Fi Direct using ________.
Neither an access point that lets them talk directly nor an Ethernet network to connect their access points
Businesses can select multimode fiber to transmit 1000BASE-SX signals farther by ________.
Neither buying fiber with lower modal bandwidth nor buying fiber with wider core diameter
In cable television, the two conductors ________.
Neither run side-by-side nor are twisted around each other
False
Network managers do not need to worry very much about cost when making decisions.
false
Networking professionals only need to worry about the SDLC-not the SLC.
Which of these terms refers to the random energy within the medium that affects the quality of electrical signals on UTP?
Noise
True
Noise errors become severe before the signal attenuates to the level of the noise floor.
A channel extends from 55 MHz to 60 MHz. Its bandwidth is ________.
None of these
An 8/1 decrease in power corresponds to approximately ________ decibels.
None of these
on/off
Optical fiber uses ________ signaling. (Give the most specific answer.)
wasteful of capacity
Overprovisioning is ________.
True
Overprovisioning is adding much more switching and transmission line capacity than will be needed much of the time.
adding much more switching and transmission line capacity than will be needed much of the time
Overprovisioning means ________.
The most popular standard for extended 802.1X security is ________.
PEAP
Which of the following has a dangerous vulnerability that is causing problems today?
PEAP
In 802.11i ________, hosts must know a shared initial key.
PSK mode
Set
SNMP ________ commands can change how managed devices operate.
trap commands
SNMP agents can initiate ________.
Which type of transmission is more widely used today?
Serial
Which type of transmission is more widely used today? A) Serial. B) Parallel. C) Both are used about equally.
Serial
True
Serial transmission is transmission over a single wire pair.
Which type of transmission is more widely used today?
Serial.
absorptive attenuation
Single mode fiber distance is limited primarily by ________.
8.3 microns
Single mode fiber has a core diameter of ________.
optical fiber
Small form factor connectors are used in ________.
When a wireless NIC wishes to transmit, it listens for traffic. If there is traffic, it waits. If there is no traffic, it may transmit.
Sometimes true.
In addition to a preamble, start of frame delimiter, and PAD, what fields does an Ethernet frame contain?
Source address, destination address, frame transmission speed, length of frame, data, and frame check sequence WRONG Destination address, source address, MAC address, length, and frame check sequence WRONG
Which statement BEST describes how a simple switch operates?
Switches rely upon routers to tell them where to send frames that the switch receives. wrong witches rely upon NIC software to know where to send frames sent by a NIC. WRONG NICs provide detailed information within each frame to help the switch decide the best alternative route for a frame. WRONG
Binary signaling is relatively immune to small errors.
TRUE
Clock cycles are necessary in binary transmission.
TRUE
Digital signaling is relatively immune to small errors.
TRUE
Ethernet processing executed in hardware.
TRUE
The Ethernet standard limits UTP propagation distances to 100 meters at all speeds up to 1 Gbps.
TRUE
Typical LAN speeds are faster than typical WAN speeds.
TRUE
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends eliminates terminal crosstalk interference.
TRUE
What type of interference is the most frequently encountered?
Terminal crosstalk interference.
False
The ability to transmit in two directions simultaneously is called parallel transmission.
operations, administration, maintenance, and provisioning
The acronym OAM&P stands for ________.
latency
The amount of time by which packets are delayed when they move through a network is called ________.
total cost of ownership
The cost of a system over its entire life cycle is called the ________.
Which of the following layers deals with messages?
The internet layer
two-pair data-grade UTP
The lowest-speed leased lines (under about 2 Mbps) use ________.
speed
The main benefit of parallel transmission over serial transmission is ________.
the mean (average) noise energy
The noise floor is ________.
jacket
The outer covering of a UTP cord is its ________.
Which of the following layers deals with messages?
The physical layer.
base
The price of hardware before adding components that will be needed in actual practice is called the ________ price.
one-pair voice-grade UTP
The residential local loop consists of ________ transmission lines.
individual
The speed that a single user receives from a multiplexed line is ________ throughput.
False
The systems development life cycle includes the operation of a system after its creation.
False
The total cost of ownership is the cost of a system during its development life cycle.
What happens if two nearby access points use the same channel?
They will interfere with each other.
False
To do compression, you do not need to have compatible equipment at the two ends of the network.
the ability to span greater distances
Today, the main benefit of optical fiber compared with UTP is ________.
physical
Topology is a ________ layer concept.
Both A and B -- filter out unwanted traffic and limit some traffic to a certain percentage of total capacity
Traffic shaping can ________.
True
Traffic shaping can substantially reduce a network's overall traffic.
False
Traffic shaping reduces traffic by assigning high priority to latency-intolerant applications while giving low priority to latency-tolerant applications.
bits per second
Transmission speed is normally measured in ________.
True
Transmission speed normally is measured in bits per second.
Attenuation is an example of a propagation effect.
True
B2-CC-67-0D-5E-BA is a valid MAC address.
True
Binary signaling is relatively immune to small errors
True
In cable television, the drop cable runs from the trunk cable into the home.
True
Noise errors become more severe as the signal attenuates to the level of the noise floor.
True
Not only can Ethernet switches send frames to distinct ports, they are also capable of broadcasting.
True
Propagation effects can make a signal unreadable at the destination.
True
As a signal propagates down a UTP cord, greater propagation distance will result in more noise errors, even if the noise level is constant.
True.
For their transmission medium, cable television companies primarily use coaxial cable.
True.
In cable television, the drop cable runs from the trunk cable into the home.
True.
Multimode optical fiber quality is measured as MHz.km.
True.
Noise errors become severe before the signal attenuates to the level of the noise floor.
True.
Serial transmission is transmission over a single wire pair.
True.
The Ethernet standard limits UTP propagation distances to 100 meters at all speeds up to 1 Gbps.
True.
In LANs, optical fiber typically is used in ________.
Trunk Lines
What type of line connects switches to other switches?
Trunk lines.
Both A and B -- interference and crosstalk interference
Twisting wires reduces ________.
data
Two-way amplifiers are needed for cable ________ service.
The longest transmission distances are possible with ________.
UTP WRONG
quality
UTP categories rate the ________ of cabling.
Which of the following has a single connector type?
UTP.
Switched Ethernet networks primarily use _____.
Unicasting
False
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends completely eliminates terminal crosstalk interference.
terminal crosstalk interference
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________.
Which of the following secures communication between the wireless computer and the server it wishes to use against evil twin attacks?
VPNs.
False
Variability in delay is called latency.
What security protocol originally came with 802.11 equipment?
WEP
Which of the above offers stronger security?
WPA
What does the Wi-Fi Alliance call 802.11i?
WPA2
What things can be changed to vary the information contained in a signal?
Wavelength, Frequency, Amplitude
62.5 microns.
What is a typical core diameter for multimode fiber?
One-pair voice-grade UTP.
What transmission medium do ALL DSL services use?
Terminal crosstalk interference
What type of interference is the most frequently encountered?
trunk lines
What type of line connects switches to other switches?
interference
When a fluorescent light interferes with UTP transmission, this is ________.
attenuation
When a signal grows weaker as it travels, this is called ________. (Choose the most specific answer.)
propagation
When a signal travels, this is called ________.
crosstalk interference
When one pair in a UTP cord interferes with signals in other pairs, this is ________.
850 nm.
Which light wavelength is the least expensive in optical fiber?
1550 nm.
Which light wavelength propagates farthest in optical fiber?
Category 6.
Which of the following UTP wiring quality standards governs many UTP cables for sale today?
UTP
Which of the following has a single connector type?
All of the above are driving forces for change -- The introduction of disruptive applications, Organizational change within the company, and the normal continuing growth of application traffic demand.
Which of the following is not a driving force for change in a company's technological infrastructure?
All of the above are categories of SDLC costs. -- Hardware costs, Software costs and Outsourcing development costs.
Which of the following is not one of the categories of SDLC costs?
All of the above are main elements in SNMP. -- The manager, Managed devices and The management information base.
Which of the following is not one of the main elements in SNMP?
Binary signaling
Which of the following is relatively immune to small errors?
The physical layer
Which of the following layers deals with messages?
All of the above -- Hardware costs, Management costs, and Software costs
Which of the following should be considered in purchasing decisions?
1.067 Mbps.
Which of the following speeds is written properly?
87.62 kbps.
Which of the following speeds is written properly?
4-pair UTP.
Which transmission medium is dominant for the wired access line between a host and the switch that serves the host?
Pure hub-and-spoke topology.
Which type of network typology is less expensive to operate?
Serial.
Which type of transmission is more widely used today?
The telephone network.
Which typically is designed to be available at least 99.999% of the time?
Lower cost.
Why is multimode fiber used instead of single-mode fiber for LAN transmission?
Either Visio or IT Guru
You can create a network diagram using ________.
Network simulation software
_______ enables network managers to envision the impacts of alternative designs.
Both A and B -- Traffic shaping and Compression
________ can help reduce the traffic coming into a network.
IT Guru
________ is a full network simulation tool.
Neither A nor B -- Noise nor Interference
________ is a major propagation problem in optical fiber.
Availability
________ is the percentage of time that a network is available for use.
Traffic Shaping
________ restricts traffic entering the network at access points.
Network topology is
________ the physical arrangement of a network's computers, switches, routers, and transmission lines.
Passive RFID chips are powered by ________.
a battery
A noise spike is ________.
a brief large increase or decrease in the noise energy
If a radio transmission is easily blocked by obstacles, then you need to maintain ________.
a clear line of sight
The other wireless device is far away in a known direction. You should use ________.
a dish antenna
In digital signaling there is (are) ________ state(s)
a few
In digital signaling there is (are) ________ state(s).
a few
The total range of possible 802.11 WLAN frequencies in the 2.4 GHz band constitutes ________.
a service band
Compared with single-mode fiber, multimode fiber has ________ core.
a wider
In the Shannon Equation, if you quadruple the bandwidth in a channel while the signal-to-noise ratio remains the same, you can transmit ________.
about 4 times as fast
Full-duplex communication:
allows a station to send and receive at the same time.
In ADSL, the residential customer needs ________.
an ADSL modem
Cellular telephony uses ________.
an omnidirectional antenna
The process of signals growing weaker as they propagate is known as:
attenuation.
Ethernet switches can provide enough power over UTP for ________.
both A and B
Channels with wide bandwidths are called ________ channels.
broadband
To transmit data very rapidly, you would want a ________ channel.
broadband
Bluetooth is for ________.
cable replacement
In the 60 GHz service band, ________.
channel bandwidth can be very wide
To handle multiple conversations in radio transmission, you use multiple ________.
channels
For their transmission medium, cable television companies primarily use ________.
coaxial cable
VLANs address the problem of _____.
congestion
CSMA/CD provides a way to:
control networks so that only one station transmits at any one moment.
A length of UTP wiring is a ________.
cord
What form of transmission is most resistant to transmission errors?
digital
Beamforming can ________.
direct signal strength at individual wireless hosts
Breaking into WLANs is ________.
drive-by hacking
A mobile phone will communicate with more functionality with a headset if it uses the Bluetooth ________.
hands-free profile
WPA ________.
has been partially cracked
Optical fiber:
has high attenuation.
Frequency is measured in terms of ________.
hertz
In a ________ topology, there is only one possible path between any two hosts.
hierarchical
If more users move to an access point, this decreases ________.
individual throughput
In VPNs designed to frustrate evil twin attacks, the shared secret ________.
is not transmitted
Lower-wavelength light dominates in optical fiber because it ________.
is the least inexpensive
Spread spectrum transmission is used in WLANs because ________.
it is required by regulators
The outer covering of a UTP cord is its ________
jacket
The outer covering of a UTP cord is its ________.
jacket
Interference is minimized in ________.
licensed bands
Ethernet's hierarchical topology tends to create ________.
lower cost per frame handled
In the Shannon Equation, C is the ________.
maximum possible speed of transmission in a channel
Multimode fiber distance is limited primarily by ________.
modal dispersion
When the light energies of multiple pulses overlap, this is ________.
modal dispersion
Compared with UTP, optical fiber is ________ expensive to buy and install today.
more
Spread spectrum transmission is used in WLANs for ________.
more reliable transmission
LANs normally use ________.
multimode fiber
Modal dispersion limits transmission distance in ________.
multimode fiber
Modal bandwidth is a measure of ________.
multimode fiber quality
The most serious problem with wireless transmission in WLANs is ________.
multipath interference
In an extended service set, each access point ________.
must have the same SSID
A high signal-to-noise ratio reduces ________ errors.
noise
Limiting the distance of UTP cords to 100 meters is done to control the number of ______.
noise errors
A local area network operates ________.
on a customer premises
Optical fiber uses ________ signaling. (Give the most specific answer.)
on/off
Small form factor connectors are used in ________.
optical fiber
Access points take ________ from wireless devices and send them on to devices on the wired LAN. They also do the converse.
packets
Two devices exchange information about the profiles they support during ________.
peering
When a signal travels, this is called ________.
propagation
Changes in a signal during propagation are called, most generally, ________.
propagation effects
Providing service is called ________.
provisioning
UTP categories rate the ________ of cabling.
quality
Attenuation with distance is faster with ________.
radio transmission
Centralized access point management ________.
reduces management costs
CSMA/CA+ACK usually is ________.
required
An unauthorized internal access point is a(n) ________.
rogue access point
Traditional MIMO can ________
send multiple signals in the same channel
If an Ethernet receiver detects an error in an arriving frame, it _____.
sends a NAK to the sender wrong sends the sender a retransmission request frame wrong
Wireless access points typically link wireless clients to ________.
servers on the wired network
Compared to 802.11, UWB has greater ________.
speed
Two Bluetooth devices will peer ________.
the first time they connect
The noise floor is ________.
the mean (average) noise energy
The frequency spectrum extends ________.
to infinity
MIMO ________.
transmits multiple signals in the same channel
In television, the ________ carries signals past the subscriber's house.
trunk cable
In LANs, optical fiber typically is used in ________.
trunk lines
What type of switch connects switches to other switches?
trunk switches wrong /workgroup switches wrong
If a company uses 802.11i for its core security protocol, an evil twin access point will set up ________ 802.11i connection(s).
two
In binary signaling there is (are) ________ state(s)
two
In binary signaling there is (are) ________ state(s).
two
Parallel transmission is transmission over ________.
two or more wire pairs
Low-speed leased lines use ________ transmission lines.
two-pair data-grade UTP
The lowest-speed leased lines (under about 2 Mbps) use ________.
two-pair data-grade UTP
WLANs normally use ________.
unlicensed bands
To drive around a city looking for working access points that are unprotected is ________.
war driving
In optical fiber, we measure light in terms of ________.
wavelength
In optical fiber, you use _____ to describe the signal.
wavelength
Using unused transmission channels in a service band is called using ________.
white space
To transmit very rapidly in RADIO, you need ________.
wide bandwidth
_____ switches normally connect a station to the network.
workgroup
