Deck 17: Data Link Control and Multiplexing

Question 1

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)Internet access
E)High-speed digital facsimile

Answer 1

A

Question 2

SONET/SDH signal payload speeds range

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

Answer 2

C

Question 3

HDLC uses CRC for error detection.

Answer 3

True

Question 4

The types of frames used in HDLC are

A)Exchanged information,information,and unnumbered.
B)Information,supervisory,and unnumbered.
C)Information,supervisory,and control.
D)Information,supervisory,and exchange.
E)Supervisory,unnumbered,and set synchronous.

Question 5

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

A)HDLC
B)Multiprogramming
C)Multi-access channels
D)Digital channels
E)Multiplexing

Question 6

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

Question 7

Sliding window is one form of error control.

Question 8

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.
E)separate frequency multiplexing.

Question 9

Present-day television,both broadcast and cable employ

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

Question 10

The term SONET corresponds to

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

Question 11

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.
E)separate frequency multiplexing.

Question 12

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

A)Error detection
B)Positive acknowledgement
C)Retransmission after timeout
D)Negative acknowledgment and retransmission
E)Damaged frame.

Question 13

Provide the full name for each of the following acronyms
ARQ
CRC
HDLC
FCS
LLC

Question 14

Data link control protocols are typically used only in asynchronous communication.

Question 15

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