Data Communication and Networking Questions

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351.

The systematic access of small computers in a distributed data processing system is referred to as:

A

dialed service

B

multiplexing

C

polling

D

conversational mode

E

None of the above

Correct Answer: C

None.

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352.

The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as:

A

modulation

B

demodulation

C

synchronizing

D

synchronizing

E

None of the above

Correct Answer: B

None.

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353.

An example of digital, rather than analog, communication is

A

DDD

B

DDS

C

WATS

D

DDT

E

None of the above

Correct Answer: B

None.

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354.

How many OSI layers are covered in the X.25 standard?

A

two

B

three

C

seven

D

six

E

None of the above

Correct Answer: B

None.

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355.

A band is always equivalent to

A

a byte

B

a bit

C

100 bits

D

16 bits

E

None of the above

Correct Answer: E

None.

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356.

What is the port number for HTTP?

A

99

B

86

C

80

D

23

E

None of the above

Correct Answer: C

None.

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357.

The most flexibility in how devices are wired together is provided by

A

bus networks

B

ring networks

C

star networks

D

T-switched networks

E

None of the above

Correct Answer: A

None.

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358.

Which of the following statement is incorrect?

A

The transport layer provides for any format, translationer code conversion necessary to put the data into an intelligible format.

B

The presentation layer transforms information from machine format to the understandable format.

C

The data link layer handles the transfer of data between the ends of a physical link.

D

All of the above

E

None of the above

Correct Answer: A

None.

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359.

When you connect to an online information service, you are asked to provide some kind of identification such as your name, an account number and a password. What is the name given to this brief dialogue between you and the information system?

A

Security procedure

B

Safeguard procedure

C

Identification procedure

D

Log-on procedure

E

None of the above

Correct Answer: D

None.

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360.

Bus is

A

one or more conductors that some as a common connection for a related group of devices

B

a continuous frequency capable of being modulated or impressed with a second signal

C

the condition when two or more stations attempt to use the same channel at the same time

D

a collection of interconnected functional units that provides a data communications service among stations attached to the network

E

None of the above

Correct Answer: A

None.

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