Discussion
Four bits are used for packed sequence numbering in a sliding window protocol used in a computer network. What is the maximum window size ?
Answer: C
Correct answer: 15
With n bits for sequence numbers a go-back-N window may be at most \( 2^{n}-1 \), one less than the number of distinct sequence numbers, so that a full window can never be mistaken for an empty one:
\[ 2^{4}-1 = 15 \]
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