Data Communication and Networking Questions

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11.

The number of cross point needed for 10 lines in a cross point switch which is full duplex in nature and there are no self connection is

A

100

B

45

C

50

D

90

Correct Answer: B

As all lines are full-duplex and there are no self connections, only the cross points above the diagonals are needed. Hence formula for the number of cross points required is n(n-1)/2.

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12.

A terminal multiplexer has six 1200 bps terminals and 'n' 300bps terminals connected to it. The outgoing line is 9600bps. What is the maximum value of n?

A

4

B

16

C

8

D

28

Correct Answer: C

Since there are six 1200bps terminals, 6*1200 + n*300 =9600 by solving this, n=8.

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13.

Maximum data rate of a channel for a noiseless 3-kHz binary channel is

A

3000bps

B

6000 bps

C

1500 bps

D

None of these

Correct Answer: B

Maximum data rate = 2Hlog2V bps, where H is the bandwidth, V is the discrete levels. Here H is 3 kHz and V is 2. So, data rate = 2*3000 log22 bps = 6000 bps.

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14.

The ________ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period.

A

Residual Error Rate.

B

Transfer Failure Probability.

C

Connection release failure probability.

D

Connection establish.

Correct Answer: A

None.

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15.

In session layer, during data transfer, the data stream responsible for the "control" purpose (i.e control of the session layer itself) is

A

Regular Data

B

Typed data

C

Capability Data

D

Expedited Data

Correct Answer: C

None.

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16.

A high speed communication equipment typically would not be needed for

A

E-mail

B

Transferring large volume of data

C

Supporting communication between nodes in a LAN

D

All of these

Correct Answer: A

None.

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17.

Which of the following ISO level is more closely related to the physical communications facilities?

A

Application

B

Session

C

Networking

D

Data Link

Correct Answer: D

None.

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18.

which of the following is not a field in the Ethernet Message packet?

A

Type

B

Data

C

Pin-code

D

Address

Correct Answer: C

None.

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19.

The Network topology that supports bi-directional links between each possible node is

A

Ring

B

Star

C

Tree

D

Mesh

Correct Answer: D

None.

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20.

In a broad Sense, a railway track is an example of

A

Simplex

B

Half Duplex

C

Full Duplex

D

All of these

Correct Answer: B

None.

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