LAN Switching and Wireless

441. In Selective Repeat ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the receive window must be _________

1. 15
2. 16
3. 31
4. 1

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442. In Selective Repeat ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the send window must be _________

1. 15
2. 16
3. 31
4. 1

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443. In slotted ALOHA, the vulnerable time is _________ the frame transmission time.

1. the same as
2. two times
3. three times
4. none of the above

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444. In SONET each frame lasts _________ microseconds.

1. 20
2. 64
3. 128
4. none of the above

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445. In SONET, for each byte, the bits are transmitted _________.

1. from least significant to the most significant
2. from most significant to the least significant
3. two at a time
4. three at a time

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446. In SONET, for each frame, the bytes are transmitted _________.

1. from left to the right, top to bottom
2. from right to the left, bottom to top
3. from left to the right, bottom to top
4. from right to the left, top to bottom

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447. In Stop-and-Wait ARQ, the acknowledgment number always announces in _________ arithmetic the sequence number of the next frame expected.

1. modulo-2
2. modulo-4
3. modulo-m
4. none of the above

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448. In Stop-and-Wait ARQ, we use sequence numbers to number the frames. The sequence numbers are based on _________arithmetic.

1. modulo-2
2. modulo-4
3. modulo-m
4. none of the above

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449. In synchronous TDM, for n signal sources of the same data rate, each frame contains _________ slots.

1. n
2. n + 1
3. n - 1
4. 0 to n

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450. In TDM, the transmission rate of the multiplexed path is usually _________ the sum of the transmission rates of the signal sources.

1. greater than
2. less than
3. equal to
4. not related to

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