Deck 3: Data Link Layer and Error Control Protocols

Question 1

In sliding window, if the window size is 63, what is the range of sequence numbers?

A)0 to 63
B)0 to 64
C)1 to 63
D)1 to 64

Answer 1

0 to 63

Question 2

Regulation of the rate of transmission of data frames is known as

A)Line discipline
B)Data rate control
C)Flow control
D)Switch control

Answer 2

Data rate control

Question 3

When a primary device wants to send data to a secondary device, it needs to first send _______ frame.

A)ACK
B)Poll
C)SEL
D)ENQ

Answer 3

ENQ

Question 4

Flow control is needed to prevent

A)Bit errors
B)Overflow of sender buffer
C)Overflow of receiver buffer
D)Collision

Question 5

A timer is set when _____________is sent.

A)Packet
B)ACK
C)NAK
D)All

Question 6

In a Go-Back-N ARQ, if the window size is 63, what is the range of sequence numbers?

A)0 to 63
B)0 to 64
C)1 to 63
D)1 to 64

Question 7

In Go-Back-N ARQ, if frames 4, 5, and 6 are received successfully, the receiver may send an ACK _______ to the sender.

A)5
B)6
C)7
D)any of the above

Question 8

ARQ stands for _______.

A)Automatic repeat quantization
B)Automatic repeat request
C)Automatic retransmission request
D)Acknowledge repeat request

Question 9

For Stop-and-Wait ARQ, for 10 data packets sent, _______ acknowledgments are needed.

A)exactly 10
B)less than 10
C)more than 10
D)none of the above

Question 10

HDLC is an acronym for _______.

A)High-duplex line communication
B)High-level data link control
C)Half-duplex digital link combination
D)Host double-level circuit

Question 11

Data link control deals with the design and procedures for ______ communication.

A)node-to-node
B)host-to-host
C)process-to-process
D)none of the above

Question 12

_______ in the data link layer separates a message from one source to a destination, or from other messages going from other sources to other destinations.

A)Digitizing
B)Controlling
C)Framing
D)none of the above

Question 13

In _______ framing, there is no need for defining the boundaries of frames.

A)fixed-size
B)variable-size
C)standard
D)none of the above

Question 14

In ________ framing, we need a delimiter (flag) to define the boundary of two frames.

A)fixed-size
B)variable-size
C)standard
D)none of the above

Question 15

_________framing uses two categories of protocols: character-oriented and bit-oriented.

A)Fixed-size
B)Variable-size
C)Standard
D)None of the above

Question 16

In a ________ protocol, the data section of a frame is a sequence of characters.

A)bit-oriented
B)character-oriented
C)either (a) or (b)
D)none of the above

Question 17

In a _________ protocol, the data section of a frame is a sequence of bits.

A)byte-oriented
B)bit-oriented
C)either (a) or (b)
D)none of the above

Question 18

In _________ protocols, we use ________.

A)character-oriented; byte stuffing
B)character-oriented; bit stuffing
C)bit-oriented; character stuffing
D)none of the above

Question 19

Byte stuffing means adding a special byte to the data section of the frame when there is a character with the same pattern as the ______.

A)header
B)trailer
C)flag
D)none of the above

Question 20

In ________ protocols, we use ________.

A)byte-oriented; bit stuffing
B)character-oriented; bit stuffing
C)bit-oriented; bit stuffing
D)none of the above

Question 21

Bit stuffing means adding an extra 0 to the data section of the frame when there is a sequence of bits with the same pattern as the ________.

A)Header
B)Trailer
C)Flag
D)None of the above

Question 22

_______ control refers to a set of procedures used to restrict the amount of data that the sender can send before waiting for acknowledgment.

A)Flow
B)Error
C)Transmission
D)None of the above

Question 23

______ control refers to methods of error detection and correction.

A)Flow
B)Error
C)Transmission
D)None of the above

Question 24

In a linear block code, the _______ of any two valid codewords creates another valid codeword

A)XORing
B)ORing
C)ANDing
D)none of the above

Question 25

A simple parity-check code can detect __________ errors.

A)an even-number of
B)two
C)no errors
D)an odd-number of