In Go-Back-N ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the send window must be _____.a.15b.16c.1d.31
Question
In Go-Back-N ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the send window must be _____.a.15b.16c.1d.31
Solution 1
In Go-Back-N ARQ, the sequence number of bits determines the size of the send window. The sequence number is used to number the frames, so the number of frames that can be sent is 2^n, where n is the number of bits. However, because we need to distinguish between new and old frames, the maximum window size is 2^n - 1.
Given that the number of bits for the sequence number is 5, the maximum size of the send window would be 2^5 - 1 = 31.
So, the answer is d. 31.
Solution 2
In Go-Back-N ARQ, the sequence number is used to number the frames. If the sequence number is 5 bits, then it can have 2^5 = 32 different values. However, in Go-Back-N ARQ, the sender window size is always one less than the total possible sequence numbers to avoid the ambiguity that can occur if the window size is equal to the total sequence numbers. This is because the receiver may not be able to distinguish between a new frame and a retransmitted frame.
So, the maximum size of the send window must be 32 - 1 = 31.
Therefore, the answer is d. 31.
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