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Data Communications > Forouzan Chapter 9 MCQ > Flashcards

Forouzan Chapter 9 MCQ Flashcards

1
Q

To use a cable network for data transmission, we need two key devices: a ________ and a _________.
A) CT; CMTS C) CM; CMS
B) CM; CMTS D) none of the above

A

CM; CMTS

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2
Q

A local telephone network is an example of a _______ network.
A) packet-switched C) circuit-switched
B) message-switched D) none of the above

A

circuit-switched

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3
Q

A traditional cable TV network transmits signals ______.
A) downstream C) upstream and downstream
B) upstream D) none of the above

A

downstream

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4
Q

The traditional cable TV system used ________cable end to end.
A) twisted-pair C) coaxial
B) fiber-optic D) none of the above

A

coaxial

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5
Q

The telephone network is made of ______ major components.
A) 4 C) 2
B) 3 D) none of the above

A

3

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6
Q

Data from a computer are _______; the local loop handles _______ signals.
A) analog; analog C) digital; analog
B) digital; digital D) analog; digital

A

digital; analog

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7
Q

The original telephone network, which is referred to as the plain old telephone system (POTS), was an ________ system.
A) analog C) digital as well as analog
B) digital D) none of the above

A

analog

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8
Q

The protocol that is used for signaling in the telephone network is called ______.
A) SSS C) POP
B) SS7 D) none of the above

A

SS7

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9
Q

_______technology is a set of technologies developed by the telephone companies to provide high data rate transmission.
A) LDS C) DSL
B) ASL D) none of the above

A

DSL

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10
Q

The local loop has _______ cable that connects the subscriber telephone to the nearest end office.
A) fiber-optic C) twisted-pair
B) coaxial D) none of the above

A

twisted-pair

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11
Q

The second generation of cable networks is called a(n) _________ network.
A) HCF C) CFH
B) HFC D) none of the above

A

HFC

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12
Q

The largest portion of the bandwidth for ADSL carries _______.
A) upstream data C) control data
B) downstream data D) voice communication

A

downstream data

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13
Q

_______ is suitable for businesses that require comparable upstream and downstream data rates.
A) SDSL C) VDSL
B) ADSL D) (b) and (c)

A

SDSL

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14
Q

The carrier that handles intra-LATA services is called a(n) _____ .
A) IXC C) POP
B) LEC D) none of the above

A

LEC

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15
Q

. DMT is a modulation technique that combines elements of _______ and _______.
A) FDM; QAM C) PSK; FSK
B) FDM; TDM D) QDM; QAM

A

FDM; QAM

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16
Q

The carrier that handles inter-LATA services is called a(n) _______.
A) IXC C) POP
B) LEC D) none of the above

A

IXC

17
Q

. The modern telephone network is now ________.
A) digital C) analog
B) digital as well as analog D) none of the above

A

digital as well as analog

18
Q

In an HFC network, the upstream data are modulated using the _______ modulation technique.
A) ASK C) QAM
B) PCM D) QPSK

A

QPSK

19
Q

_______ was designed as an alternative to the T-1 line.
A) ADSL C) VDSL
B) HDSL D) SDSL

A

HDSL

20
Q

HDSL encodes data using _______.
A) 2B1Q C) 4B/5B
B) 1B2Q D) 6B/8T

A

2B1Q

21
Q

In an HFC network, the downstream data are modulated using the _______ modulation technique.
A) PCM C) PSK
B) QAM D) ASK

A

QAM

22
Q

Another name for the cable TV office is the _______.
A) head end C) fiber node
B) combiner D) splitter

A

head end

23
Q

The term modem is a composite word that refers to the two functional entities that make up the device: a signal _______ and a signal _______.
A) demodulator; modulator C) modern; demo
B) modulator; demodulator D) none of the above

A

modulator; demodulator

24
Q

The two most common digital services are ________ service and ______.
A) switched/56; DDS C) DDS; switched 64
B) switched/56; switched/64 D) leased; out-of-band

A

switched/56; DDS

25
Q

The United States is divided into many _______.
A) IXCs C) LATAs
B) LECs D) none of the above

A

LATAs

26
Q

The standard for data transmission over an HFC network is called _______.
A) ADSL C) DOCSIS
B) CMTS D) MCNS

A

DOCSIS

27
Q

. In ________signaling, a portion of the bandwidth is used for signaling and another portion for data.
A) mixed C) out-of-band
B) in-band D) none of the above

A

out-of-band

28
Q

Telephone companies provide two types of analog services: analog _______ services and analog _____services.
A) leased; out-of-band C) switched; in-band
B) out-of-band; in-band D) switched; leased

A

switched; leased

29
Q

The HFC network uses _______ cable.
A) coaxial C) fiber-optic
B) twisted-pair D) a combination of (a) and (c)

A

coaxial and fiber-optic

30
Q

In ______signaling, the same circuit is used for both signaling and data.
A) mixed C) in-band
B) out-of-band D) none of the above

A

in-band

31
Q

Most popular modems available are based on the ________standards.
A) X-series C) VX-series
B) V-series D) none of the above

A

V-series

Data Communications (10 decks)

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