Data Communication and Networking Questions

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131.

You are working with three networks that have the network IDs 192.168.5.0, 192.168.6.0, and 192.168.7.0. What subnet mask can you use to combine these addresses into one?

A

255.255.252.0

B

225.255.254.0

C

255.255.255.240

D

255.255.255.252

Correct Answer: A

None.

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132.

With an IP address set starting with 150, you currently have six offices that you are treating as subnets. Plans are in place to open 10 more offices before the end of the year. What subnet mask should you use to satisfy the needed number of subnets and maximize the number of hosts available at each site?

A

192

B

224

C

240

D

248

E

252

Correct Answer: D

None.

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133.

A machine that connects to two or more electronic mail systems and transfers mail messages among them is known as

A

Gateways

B

mail gateway

C

bridges

D

User Agent

E

None of the above

Correct Answer: B

None.

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134.

If digital data rate of 9600 bps is encoded using 8-level phase shift keying (PSK) method, the modulation rate is

A

1200 bands

B

3200 bands

C

4800 bands

D

9600 bands

E

None of the above

Correct Answer: B

None.

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135.

Error detection at a data link level is achieved by

A

bit stuffing

B

cyclic redundancy codes

C

Hamming codes

D

equalization

E

None of the above

Correct Answer: B

None.

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136.

When the computer provides the manager with a multiple choice of possible answers, the prompting technique is

A

question and answer

B

form filling

C

open-ended question

D

menu selection

E

None of the above

Correct Answer: D

None.

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137.

Which network topology is considered passive?

A

Cross

B

Ring

C

Star

D

Mesh

E

Bus

Correct Answer: E

None.

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138.

If a firm wanted to transmit data from 1,000 punched cards to a remote computer, they would use a(n)

A

POS terminal

B

data collection terminal

C

batch processing terminal

D

intelligent terminal

E

None of the above

Correct Answer: C

None.

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139.

Which address is the loopback address?

A

0.0.0.1

B

127.0.0.0

C

127.0.0.1

D

255.255.255.255

E

None of the above

Correct Answer: C

None.

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140.

Error rate is

A

an error-detecting code based on a summation operation performed on the bits to be checked.

B

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

None.

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