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Computer Network

121.

The terms "low speed" and "high speed," applied to logic circuits, refer to the ________.

Answer: C

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122.

A 2-input gate that can be used to pass a digital waveform unchanged at certain times and inverted at other times is a(n) ________.

Answer: D

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123.

For stop-and-wait flow control, for n data packets sent, how many acknowledgments are needed ?

Answer: A

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124.

How many entries would a truth table for a four-input NAND gate have?

Answer: C

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125.

Which of the following uses an 8B/6T encoding scheme?

Answer: C

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126.

If A is LOW or B is LOW or BOTH are LOW, then X is LOW. If A is HIGH and B is HIGH, then X is HIGH. These rules specify the operation of a(n) ________.

Answer: A

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127.

A 3000 Hz bandwidth noisy channel transmits bits with a signal to thermal noise ratio of 30 dB. What is the maximum data rate of the channel ?

Answer: A

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Answer: C

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129.

What signal-to-noise ratio is needed to put a T1 carrier on a T0-kHz line ?

Answer: D

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130.

In sliding window flow control, if window size is 63, what is the range of sequence numbers ?

Answer: A

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