Data Questions

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1.

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

Correct Answer: A

None.

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2.

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

Correct Answer: C

None.

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3.

ARQ stands for _______.

A

Automatic repeat quantization

B

Automatic repeat request

C

Automatic retransmission request

D

Acknowledge repeat request

Correct Answer: B

None.

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4.

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

Correct Answer: A

None.

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5.

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

Correct Answer: B

None.

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6.

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

Correct Answer: A

None.

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7.

______ 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

Correct Answer: C

None.

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8.

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

Correct Answer: A

None.

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9.

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

Correct Answer: B

None.

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10.

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

A

Fixed-size

B

Variable-size

C

Standard

D

None of the above

Correct Answer: B

None.

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