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Computer Networks CT-2

Total questions: 20

Worksheet time: 40mins

Name
Class
Date
1.

The data link layer takes the packets from _________ and encapsulates them into frames for transmission.

a)

network layer

b)

physical layer

c)

transport layer

d)

application layer

2.

Automatic repeat request error management mechanism is provided by ________.

a)

media access control sublayer

b)

logical link control sublayer

c)

network interface control sublayer

d)

application access control sublayer

3.

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

4.

ARQ stands for _______.

a)
  • Automatic repeat quantization

b)
  • Automatic retransmission request

c)
  • Automatic repeat request

d)
  • Acknowledge repeat request

5.

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

a)

Variable-size

b)

Standard

c)

Fixed-size

d)

None of the above

6.

Which of the following is a data link protocol?

a)

ethernet

b)

point to point protocol

c)

hdlc

d)

all of the mentioned

7.

The technique of temporarily delaying outgoing acknowledgements so that they can be hooked onto the next outgoing data frame is called ____________.

a)

cyclic redundancy check

b)

piggybacking

c)

fletcher’s checksum

d)

parity check

8.

In ________ protocols, we use ________.

a)
  • byte-oriented; bit stuffing

b)
  • character-oriented; bit stuffing

c)
  • bit-oriented; bit stuffing

d)
  • none of the above

9.

_______ 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

10.

The Simplest Protocol and the Stop-and-Wait Protocol are for ______ channels.

a)
  • noiseless

b)
  • noisy

c)
  • either (a) or (b)

d)
  • neither (a) nor (b)

11.

The _______Protocol has flow control, but not error control.

a)
  • Stop-and-Wait

b)
  • Simplest

c)
  • Go-Back-N ARQ

d)
  • Selective-Repeat ARQ

12.

Both Go-Back-N and Selective-Repeat Protocols use a _________.

a)
  • sliding frame

b)
  • sliding packet

c)
  • sliding window

d)
  • none of the above

13.

In Go-Back-N ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the receive window must be _____.

a)
  • 15

b)
  • 16

c)
  • 1

d)
  • 31

14.

The most common protocol for point-to-point access is the Point-to-Point Protocol (PPP), which is a _________protocol.

a)
  • byte-oriented

b)
  • bit-oriented

c)
  • character-oriented

d)
  • none of the above

15.

In _________, the station configuration is unbalanced. We have one primary station and multiple secondary stations.

a)
  • ARM

b)
  • NBM

c)
  • NRM

d)
  • ABM

16.

In PPP, the ________ is responsible for establishing, maintaining, configuring, and terminating links.

a)
  • LCP

b)
  • NCP

c)
  • PAP

d)
  • CHAP

17.

Both HDLC and PPP are Data link layer protocols.

a)

True

b)

False

18.

PPP provides the _______ layer in the TCP/IP suite.

a)

Network

b)

Link

c)

Transport

d)

Application

19.

The link necessarily begins and ends with this phase. During the ______ phase, the LCP automata will be in INITIAL or STARTING states.

a)

Link establishment phase

b)

Link-termination phase

c)

Link dead phase

d)

Authentication phase

20.

Which category of HDLC frames undergoes error and flow control mechanisms by comprising send and receive sequence numbers?

a)

S-frames

b)

U-frames

c)

I-frames

d)

All of the above