Data Communication and Networking Questions

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41.

Which switch is a multistage switch with micro switches at each stage that route the packets based on the output port represented as a binary string?

A

Banyan switch

B

Crossbar switch

C

Multistage crossbar

D

Packet switch

Correct Answer: A

None.

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42.

How many digits of the DNIC (Data Network Identification Code) identify the country?

A

first three

B

first four

C

first five

D

first six

E

None of the above

Correct Answer: A

None.

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43.

A station in a network forwards incoming packets by placing them on its shortest output queue. What routing algorithm is being used?

A

hot potato routing

B

flooding

C

static routing

D

delta routing

E

None of the above

Correct Answer: A

None.

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44.

The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to

A

0.003

B

0.009

C

0.991

D

0.999

E

None of the above

Correct Answer: B

None.

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45.

Frames from one LAN can be transmitted to another LAN via the device

A

Router

B

Bridge

C

Repeater

D

Modem

E

None of the above

Correct Answer: B

None.

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46.

Which of the following condition is used to transmit two packets over a medium at the same time?

A

Contention

B

Collision

C

Synchronous

D

Asynchronous

E

None of the above

Correct Answer: B

None.

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47.

You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?

A

255.240.0.0

B

255.248.0.0

C

255.252.0.0

D

255.254.0.0

E

255.255.255.255

Correct Answer: D

None.

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48.

What are the most commonly used transmission speeds in BPS used in data communication?

A

300

B

1200

C

2400

D

9600

E

None of the above

Correct Answer: D

None.

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49.

What is the default subnet mask for a class C network?

A

127.0.0.1

B

255.0.0.0

C

255.255.0.0

D

255.255.255.0

E

None of the above

Correct Answer: D

None.

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50.

Which of the following is used for modulation and demodulation?

A

modem

B

protocols

C

gateway

D

multiplexer

E

None of the above

Correct Answer: A

None.

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