GATE CS 2015 Set 1 — Question 36
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Computer Networks → Data Link Layer → Efficiency Numericals
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Question
Suppose that the stop-and-wait protocol is used on a link with a bit rate of 64 kilobits per second and 20 milliseconds propagation delay. Assume that the transmission time for the acknowledgement and the processing time at nodes are negligible. Then the minimum frame size in bytes to achieve a link utilization of at least 50% is ___________.
Correct answer
160 to 160
Solution
For stop-and-wait with negligible ACK transmission and processing time, the link utilization isOfficial answer (160 bytes). The official key takes the 20 ms as the total waiting time per frame after transmission (the round trip), i.e. . ThenNote on the dispute. If 20 ms is read as the one-way propagation delay (the usual meaning), the round trip is ms, giving ms, bits bytes. The official GATE 2015 key accepts only 160, so that is the stored answer.Answer: 160 (official key)
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