题目内容

The sequence number used in Protocol 3 can range between 0 and 1.

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Procotol 3 uses timer and sequence number.

Protocol 2 considers noise on the channel and requires feedback from receiver.

For CRC, if reciever finds there is a remainder, there must have been an error.

If the error rate of physical link is high, error detection and retransmission is usually more efficient