Computer Science - Networking

31. 

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

Answer: Option B

Explanation:

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32. 

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

A. transport
B. network
C. data link
D. physical
E. None of the above

Answer: Option D

Explanation:

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33. 

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

Answer: Option B

Explanation:

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34. 

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

Answer: Option A

Explanation:

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35. 

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

Answer: Option C

Explanation:

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