Data Communication and Networking Questions

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291.

RS-449/442-A/423-A is

A

a set of physical layer standards developed by EIA and intended to replace RS-232-C.

B

a check bit appended to an array of binary digits to make the sum of the all the binary digits

C

a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and

D

the ratio of the number of data units in error to the total number of data units

E

None of the above

Correct Answer: A

None.

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292.

Which of the following digits are known as the area code of the Network User Address (NUA)?

A

05-Jul

B

01-Apr

C

08-Dec

D

13-14

E

None of the above

Correct Answer: A

None.

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293.

End-to-end connectivity is provided from host-to-host in:

A

Network layer

B

Session layer

C

Data link layer

D

Transport layer

E

None of the above

Correct Answer: D

None.

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294.

A form of modulation In which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal, is known as

A

Aloha

B

Angle modulation

C

Amplitude modulation

D

modem

E

None of the above

Correct Answer: C

None.

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295.

CSMA (Carrier Sense Multiple Access) 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: B

None.

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296.

Which of the following summation operation is performed on the bits to check an error-detecting code?

A

Codec

B

Coder-decoder

C

Checksum

D

Attenuation

E

None of the above

Correct Answer: C

None.

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297.

The standard suit of protocols used by the Internet, intranets, extranets, and some other networks.

A

TCP/IP

B

Protocol

C

Open Systems

D

Internetwork processor

E

Hybrid hub

Correct Answer: A

None.

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298.

Networks that follow the 802.5 standard appear to be in a star topology but are actually operating in what type of topology?

A

Linear bus

B

Modified star

C

Modified ring

D

Ring

E

Hybrid hub

Correct Answer: D

None.

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299.

A communications device that combines transmissions from several I/O devices into one line is a:

A

concentrator

B

modifier

C

multiplexer

D

full-duplex line

E

None of the above

Correct Answer: C

None.

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300.

The main difference between synchronous and asynchronous transmission is

A

the clocking is derived from the data in synchronous transmission

B

the clocking is mixed with the data in asynchronous transmission

C

the pulse height is different.

D

the bandwidth required is different

E

None of the above

Correct Answer: A

None.

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