Quiz Week 4

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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


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