Data Communication and Networking Questions

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371.

What is the name of the network topology in which there are bi-directional links between each possible node?

A

Ring

B

Star

C

Tree

D

Mesh

E

None of the above

Correct Answer: D

None.

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372.

What is the main purpose of a data link content monitor?

A

to detect problems in protocols

B

to determine the type of transmission used in a data link

C

to determine the type of switching used in a data link.

D

to determine the flow of data

E

None of the above

Correct Answer: A

None.

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373.

Synchronous protocols

A

transmit characters one at a time

B

allow faster transmission than asynchronous protocols do

C

are generally used by personal computers

D

are more reliable

E

None of the above

Correct Answer: B

None.

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374.

To set up a bulletin board system you need

A

a smart modem with auto-answer capabilities

B

a telephone line

C

a personal computer

D

All of the above

E

None of the above

Correct Answer: D

None.

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375.

Videotex is a combination of

A

television

B

communication

C

computer technology

D

All of the above

E

None of the above

Correct Answer: D

None.

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376.

Which of the following frequency ranges is used for AM radio transmission?

A

Very Low Frequency : 3 kHz to 30 kHz

B

Medium Frequency : 300 kHz to 3 MHz

C

High Frequency : 3 MHz to 30 MHz

D

Very High Frequency : 30 MHz to 300 MHz

E

None of the above

Correct Answer: B

None.

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377.

Baseband is

A

transmission of signals without modulation

B

a signal all of whose energy is contained within a finite frequency range

C

the simultaneous transmission of data to a number of stations

D

All of the above

E

None of the above

Correct Answer: A

None.

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378.

A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?

A

32 Kbps

B

64 Kbps

C

8 Kbps

D

128 Kbps.

E

None of the above

Correct Answer: A

None.

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379.

X.21 is

A

a method of determining which device has access to the transmission medium at any time

B

a method access control technique for multiple-access transmission media

C

a very common bit-oriented data link protocol issued by ISO

D

network access standard for connecting stations to a circuit-switched network

E

None of the above

Correct Answer: D

None.

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380.

What is the minimum number of wires required for sending data over a serial communications links?

A

2

B

1

C

4

D

3

E

None of the above

Correct Answer: A

None.

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