Data Communication and Networking Questions

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171.

The signal to noise ratio for a voice grade line is 30.1 dB (decibels) or a power ratio of 1023:1. The maximum achievable data rate on this line whose spectrum ranges from 300 Hz to 4300 Hz is

A

6200 bps

B

9600 bps

C

34000 bps

D

31000 bps

E

None of the above

Correct Answer: D

None.

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172.

TCP is:

A

Operates at the Data Link layer

B

Connection orientated and unreliable

C

Connection orientated and reliable

D

Connectionless and unreliable

E

None of the above

Correct Answer: C

None.

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173.

An encyclopedic database

A

is an information utility that specializes in storing and searching information

B

is generally free

C

is easy for beginners to use

D

All of the above

E

None of the above

Correct Answer: A

None.

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174.

Which of the following statements is correct?

A

Protocol converters are the same as multiplexers

B

Protocol converters are the same as TDMs

C

Protocol converters are usually not operated in pairs.

D

Protocol converters are usually operated in

E

None of the above

Correct Answer: C

None.

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175.

The dialogue techniques for terminal use do not include

A

questions and answers

B

open-ended questions

C

form fillings

D

menu display

E

None of the above

Correct Answer: B

None.

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176.

You have a network ID of 192.168.10.0 and require at least 25 host IDs for each subnet, with the largest amount of subnets available. Which subnet mask should you assign?

A

255.255.255.192

B

255.255.255.224

C

255.255.255.240

D

255.255.255.248

E

255.255.255.255

Correct Answer: B

None.

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177.

The encoding method specified in the EIA-232 standard is _____.

A

NRZ-I

B

NRZ-L

C

Manchester

D

Differential Manchester

E

None of the above

Correct Answer: B

None.

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178.

Examples are packet switching using frame relay, and cell switching using ATM technologies. Select the best fit for answer:

A

Bandwidth alternatives

B

Switching alternating

C

Inter organizational networks

D

Extranets

E

None of the above

Correct Answer: B

None.

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179.

The physical layer, in reference to the OSI model, defines

A

data link procedures that provide for the exchange of data via frames that can be sent and received

B

the interface between the X.25 network and packet mode device

C

the virtual circuit interface to packet-switched service

D

All of the above

E

None of the above

Correct Answer: B

None.

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180.

A required characteristic of an online real-time system is:

A

more than one CPU

B

offline batch processing

C

no delay in processing

D

All of the above

E

None of the above

Correct Answer: C

None.

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