Data Communication and Networking Questions

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1.

Protocols are

A

Agreements on how communication components and DTE

B

Logical communication channels used for transferri

C

Physical communication channels used for transferr

D

None of the above

Correct Answer: A

None.

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2.

The method of communication in which transmission takes place in both directions, but only one direction at a time is called

A

Simplex

B

Four wire circuit

C

Full Duplex

D

Half Duplex

Correct Answer: D

None.

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3.

Error detection at the data link level is achieved by

A

Bit Stuffing

B

Cyclic Redundancy Code

C

Hamming Code

D

Equalization

Correct Answer: B

None.

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4.

Which of the following is a wrong example of network layer?

A

Internet Protocol (IP) - ARPANET

B

X.25 Packet Level Protocol (PLP)-ISO

C

Source routing and domain naming-USENet

D

X.25 level 2-ISO

Correct Answer: D

None.

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5.

The topology with highest reliability is:

A

Bus topology

B

Star topology

C

Ring topology

D

Mesh topology

Correct Answer: D

Mess Topology is a network setup where each computer and network device is interconnected with one another, allowing for most transmissions to be distributed, even if one of the connections go down. This topology is not commonly used for most computer networks as it is difficult and expensive to have redundant connection to every computer. However, this topology is commonly used for wireless networks.

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6.

"BAUD" rate means

A

The number of bits transmitted per unit time.

B

The number of bytes transmitted per unit time.

C

The rate at which the signal changes.

D

None of the above

Correct Answer: C

None.

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7.

Start and stop bits are used in serial communication for

A

Error detection

B

Error correction

C

Synchronization

D

Slowing down the communication

Correct Answer: C

None.

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8.

Unmodulated signal coming from a transmitter is know as

A

Carrier signal

B

Baseband signal

C

Primary signal

D

None of these

Correct Answer: B

None.

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9.

How many Character per sec(7bits + 1parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 "Start" and 1 "stop" bit)?

A

300

B

240

C

250

D

275

Correct Answer: A

Start and stop bits are not needed in synchronous transfer of data. So, it is 2400/8=300.

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10.

Which one of the following network uses dynamic or adaptive routing?

A

TYMNET

B

ARPANET

C

SNA(IBM's System Network Architechture)

D

None of these

Correct Answer: B

None.

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