Data Communication and Networking Questions

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271.

What is the minimum number of wires needed to send data over a serial communication link layer?

A

1

B

2

C

4

D

6

E

none of the above

Correct Answer: B

None.

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272.

The _____ layer is the layer closest to the transmission medium.

A

transport

B

network

C

data link

D

physical

E

None of the above

Correct Answer: D

None.

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273.

What is the name of the device that connects two computers by means of a telephone line?

A

Tape

B

modem

C

bus

D

cable

E

None of the above

Correct Answer: B

None.

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274.

What is the main difference between DDCMP and SDLG?

A

DDCMP does not need special hardware to final the beginning of a message.

B

DDCMP has a message header

C

SDLC has a IP address

D

SDLC does not use CRC

E

None of the above

Correct Answer: A

None.

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275.

On a class B network, how many subnets are available with a subnet mask of 248?

A

2

B

6

C

30

D

62

E

126

Correct Answer: C

None.

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276.

Ethernet networks can be cabled in a number of topologies, depending on what works best in each environment. As more nodes are added, the efficiency of Ethernet decreases. Select the best answer as to why Ethernet becomes less efficient as size increases.

A

Network collisions occur

B

Repeaters cannot increase the signal strength sufficiently

C

Cable terminators do not reflect the signal properly

D

Cable terminators do not absorb the signal properly

E

"Line echo" occurs due to the impedance of the cable

Correct Answer: A

None.

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277.

In a _____ topology, if there are n devices in a network, each device has n - 1 ports for cables.

A

ring

B

bus

C

star

D

mesh

E

None of the above

Correct Answer: D

None.

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278.

Typewriter terminals can print computer-generated data at a rate of

A

10 characters per second

B

120 characters per second

C

120 characters per minute

D

1200 characters per minute

E

None of the above

Correct Answer: B

None.

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279.

To avoid transmission errors, a check figure is calculated by the

A

transmitting computer

B

receiving computer

C

both A and B

D

Start and stop bit

E

None of the above

Correct Answer: C

None.

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280.

What is the first octet range for a class A IP address?

A

1 - 126

B

192 - 255

C

192 - 223

D

1 - 127

E

128 - 191

Correct Answer: A

None.

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