Computer Networks · Question 28 · Hard
Computer Networks question 28
On a link, transmitting one frame takes 1 ms and the one-way propagation delay is 4.5 ms. Ignoring ACK transmission and processing time, what is the minimum sender window size (in frames) for 100% link utilisation with a sliding-window protocol?
- 10
- 9
- 5
- 11
Answer and explanation
Answer: A. 10
Explanation: The sender must keep transmitting until the first ACK returns after 1 + 2 × 4.5 = 10 ms. With 1 ms per frame that needs 10 frames in flight, that is, window = 1 + 2a with a = 4.5.
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