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. 15
b. 16
c. 1
d. 31
Solution
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.
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