Forouzan Chapter 9 MCQ Flashcards
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
CM; CMTS
A local telephone network is an example of a _______ network.
A) packet-switched C) circuit-switched
B) message-switched D) none of the above
circuit-switched
A traditional cable TV network transmits signals ______.
A) downstream C) upstream and downstream
B) upstream D) none of the above
downstream
The traditional cable TV system used ________cable end to end.
A) twisted-pair C) coaxial
B) fiber-optic D) none of the above
coaxial
The telephone network is made of ______ major components.
A) 4 C) 2
B) 3 D) none of the above
3
Data from a computer are _______; the local loop handles _______ signals.
A) analog; analog C) digital; analog
B) digital; digital D) analog; digital
digital; analog
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
analog
The protocol that is used for signaling in the telephone network is called ______.
A) SSS C) POP
B) SS7 D) none of the above
SS7
_______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
DSL
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
twisted-pair
The second generation of cable networks is called a(n) _________ network.
A) HCF C) CFH
B) HFC D) none of the above
HFC
The largest portion of the bandwidth for ADSL carries _______.
A) upstream data C) control data
B) downstream data D) voice communication
downstream data
_______ is suitable for businesses that require comparable upstream and downstream data rates.
A) SDSL C) VDSL
B) ADSL D) (b) and (c)
SDSL
The carrier that handles intra-LATA services is called a(n) _____ .
A) IXC C) POP
B) LEC D) none of the above
LEC
. DMT is a modulation technique that combines elements of _______ and _______.
A) FDM; QAM C) PSK; FSK
B) FDM; TDM D) QDM; QAM
FDM; QAM
The carrier that handles inter-LATA services is called a(n) _______.
A) IXC C) POP
B) LEC D) none of the above
IXC
. The modern telephone network is now ________.
A) digital C) analog
B) digital as well as analog D) none of the above
digital as well as analog
In an HFC network, the upstream data are modulated using the _______ modulation technique.
A) ASK C) QAM
B) PCM D) QPSK
QPSK
_______ was designed as an alternative to the T-1 line.
A) ADSL C) VDSL
B) HDSL D) SDSL
HDSL
HDSL encodes data using _______.
A) 2B1Q C) 4B/5B
B) 1B2Q D) 6B/8T
2B1Q
In an HFC network, the downstream data are modulated using the _______ modulation technique.
A) PCM C) PSK
B) QAM D) ASK
QAM
Another name for the cable TV office is the _______.
A) head end C) fiber node
B) combiner D) splitter
head end
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
modulator; demodulator
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
switched/56; DDS
The United States is divided into many _______.
A) IXCs C) LATAs
B) LECs D) none of the above
LATAs
The standard for data transmission over an HFC network is called _______.
A) ADSL C) DOCSIS
B) CMTS D) MCNS
DOCSIS
. 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
out-of-band
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
switched; leased
The HFC network uses _______ cable.
A) coaxial C) fiber-optic
B) twisted-pair D) a combination of (a) and (c)
coaxial and fiber-optic
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
in-band
Most popular modems available are based on the ________standards.
A) X-series C) VX-series
B) V-series D) none of the above
V-series
