Computer Networks · Question 23 · Medium
A Selective Repeat ARQ protocol uses 4-bit sequence numbers. What is the maximum window size?
- 15
- 16
- 7
- 8
Answer and explanation
Answer: D. 8
Explanation: Selective Repeat needs the window to be at most half the sequence-number space, so the receiver never confuses new frames with retransmissions: 2^4 / 2 = 8. (Go-Back-N would allow 2^4 - 1 = 15.)
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