Deck 6: Data Link Control and Multiplexing

Question 1

A multiplexing technique where multiple users use distinct carrier frequencies separated such that the modulated signals do not overlap is called ___________.

A)frequency division multiplexing
B)time division multiplexing
C)separate channel multiplexing
D)common channel multiplexing

Answer 1

A

Question 2

Physical interface standards include all of the required functions for data communication.

Answer 2

False

Question 3

In early business computer networks,communication lines were primarily provided by CLECs.

Answer 3

False

Question 4

The two commonly used forms of ARQ are "stop-and-wait" and "go back N".

Question 5

A major source of expense in any business distributed data processing environment is transmission cost.

Question 6

Stop-and-wait is the simplest form of flow control.

Question 7

A data link control protocol includes techniques for regulating the flow of data over a communications link and for compensating for transmission errors.

Question 8

A disadvantage of sliding window flow control is that it is not supported by many data link control protocols.

Question 9

Data link control protocols are only used in private WANs.

Question 10

Data link control protocols provide mechanisms by which the two sides cooperate in the retransmission of frames that are detected to include errors.

Question 11

The organization sacrifices efficiency when it wastes money on communication lines with capacities that are much higher than it needs.

Question 12

Which of the following is a generic term that describes sharing of a communications channel by multiple communicating stations?

A)multiprogramming
B)multiplexing
C)multi-access channels
D)digital channels

Question 13

Flow control is one of the primary functions performed at the data link layer of the OSI reference model for network communication.

Question 14

It is common for a printer to be equipped with a higher data rate capability than its printing capability.

Question 15

A multiplexing technique where multiple users use distinct time slots such that the transmitted bits are shared by all users is called ___________.

A)frequency division multiplexing
B)time division multiplexing
C)separate channel multiplexing
D)common channel multiplexing

Question 16

Sliding window is one form of error control.

Question 17

Which of the following is NOT a common component of an error control process?

A)damaged frame
B)error detection
C)positive acknowledgement
D)retransmission after timeout

Question 18

Sharing capacity with other communication devices is multiplexing.

Question 19

In order to achieve the greatest return on their data communication investments,it is important for businesses to maximize the amount of information carried over their transmission lines.

Question 20

Present-day television,both broadcast and cable,employ:

A)frequency division multiplexing
B)separate channel multiplexing
C)separate frequency multiplexing
D)common channel multiplexing

Question 21

Which of the following is a common technique for error control?

A)error detection
B)retransmission after timeout
C)positive acknowledgement
D)all of the above

Question 22

One of the most popular forms of synchronous TDM is known as ________.

Question 23

Most cordless digital telephone systems used in homes employ ________ or time division duplexing along with FDM.

A)TDMA
B)GSM
C)ITU-T
D)SDH

Question 24

SONET / SDH signal payload speeds range:

A)from 902 Mbps to 1.53 Gbps
B)from 1.8 Mbps to 2.4 Gbps
C)from 50 Mbps to 1.53 Gbps
D)from 1.80 Mbps to 153 Gbps

Question 25

The set of time slots dedicated to one source,from frame to frame,is called a ________.

Question 26

__________ is an optical transmission interface that was originally designed for the public telephone network and has been standardized by ANSI for voice,long-haul data,and / or video traffic applications.

Question 27

_______ is the most heavily used multiplexing technique and is familiar to anyone who has ever used a radio or television set.

A)FDM
B)TDM
C)RTM
D)TRMT

Question 28

Although the use of ________ for voice transmission is declining,it is still used widely for television distribution systems,including broadcast television and cable TV.

Question 29

The term "SONET" corresponds to:

A)special operations networking environment testing
B)synchronous optical networking environment testing
C)synchronous optical network
D)synchronous operational networking

Question 30

________ is a technique for assuring that a transmitting entity does not overwhelm a receiving entity with data.

Question 31

With ________ the light steaming through the fiber consists of many colors,or wavelengths,each carrying a separate channel of data.

A)LCF
B)WDM
C)TDM
D)FWD

Question 32

_________ standards provide a means by which a stream of data can be transmitted,either synchronously or asynchronously,onto a transmission medium.

Question 33

________ is popular for constructing private networks within geographically dispersed organizations and is increasingly used to provide business-user access to public telephone networks

A)UTI-1
B)PBX
C)FDM
D)T-1

Question 34

________ uses multiple carrier signals at different frequencies,sending some of the bits on each channel.

A)FWD
B)DMT
C)WDM
D)TDM

Question 35

________ is used on SONET to support long-haul voice,data,and video applications over fiber-optic circuits.

A)WDM
B)TDM
C)DMT
D)LMV

Question 36

_________ is possible when the data rate of the transmission medium exceeds the required data rate of signals to be transmitted and a number of digital signals,or analog signals carrying digital data,can be carried simultaneously by interleaving portions of each signal in time.

Question 37

The data transmitted by a synchronous TDM system are organized into ________,each of which contains a cycle of time slots.

Question 38

Which of the following is NOT one of the example applications of T-1 leased transmission facilities?

A)cable television systems
B)private data networks
C)video teleconferencing
D)high-speed digital facsimile

Question 39

________ is used in fiber-to-the-home (FTTH)systems.

Question 40

A __________ frame is a recognizable frame that arrives,but some of the bits have been altered during transmission.

Question 41

________ refers to a connection's ability to weather changes to topology,protocol,and speed as a user moves.

Question 42

When ________ is used,the radio spectrum used to connect mobile devices and cell towers is divided into separate frequency channels; each channel is capable of carrying one call.

Question 43

To prevent interference,the channels are separated by ________,which are unused portions of the spectrum.

Question 44

The higher the ________ rate,the more cost-effective the transmission facility.

Question 45

Two types of multiplexing techniques discussed in this chapter are FDM and _______.