Data Communication and Networking Questions

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441.

What frequency range is used for TV transmission and low power microwave applications?

A

Very Low Frequency : 3 kHz to 30 kHz

B

Medium Frequency : 300 kHz to 3 MHz

C

Ultra High Frequency : 300 MHz to 3000 MHz

D

Super High Frequency : 3000 MHz to 30000 MHz

E

None of the above

Correct Answer: C

None.

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442.

Which of the following statement is correct?

A

Satellite transponders use a higher frequency for reception of radiation from earth stations and lower frequency for transmission to earth stations.

B

Satellite transponders contain a device that echos the radiation without change from one point on earth to another

C

Satellite transponder contain devices that transform the message sent from one location on earth to a different code for transmission to another location

D

satellite transponders us lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations

E

None of the above

Correct Answer: A

None.

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443.

We can receive data either through our television aerial or down our telephone lines and display this data on our television screen. What is the general name given to this process?

A

Viewdata

B

Teletext

C

Telesoftware

D

Videotex

E

None of the above

Correct Answer: D

None.

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444.

ASK, PSK, FSK, and QAM are examples of _____ encoding.

A

digital-to-digital

B

digital-to-analog

C

analog-to-analog

D

analog-to-digital

E

None of the above

Correct Answer: B

None.

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445.

The data-link layer, in reference to the OSI model, specifies

A

data link procedures that provide for the exchange of data via frames that can be sent and received

B

the interface between the X.25 network and packet mode device

C

the virtual circuit interface to packet-switched service

D

All of the above

E

None of the above

Correct Answer: A

None.

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446.

What function does a serial interface perform in data communication?

A

Converts serial data into audio signals

B

Converts analog signals into digital signals

C

Converts parallel data into a stream of bits

D

Decodes incoming signals into computer data

E

None of the above

Correct Answer: C

None.

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447.

You need to determine whether IP information has been assigned to your Windows NT. Which utility should you use?

A

NBTSTAT

B

NETSTAT

C

IPCONFIG

D

WINIPCFG

E

PING

Correct Answer: C

None.

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448.

Eight stations are competing for the use of the shared channel using the modified Adaptive free walk protocol by Gallager. If the stations 7 and 8 are suddenly become ready at once, how many bit slots are needed to resolve the contention?

A

1 slots

B

5 slots

C

10 slots

D

14 slots

E

None of the above

Correct Answer: B

None.

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449.

When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in metres permitted in this null-modem connection?

A

80

B

100

C

30

D

150

E

None of the above

Correct Answer: C

None.

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450.

Modulation in which the two binary values are represented by two different amplitudes of the carrier frequency is known as

A

Amplitude-shift keying

B

Amplitude

C

Amplitude modulation

D

Aloha

E

None of the above

Correct Answer: A

None.

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