Computer-Networks

Question 953

Station A uses 32-byte packets to transmit messages to Station B using a sliding window protocol. The round trip delay between A and B is 80 ms and the bottleneck bandwidth on the path between A and B is 128 kbps. What is the optimal window size that A should use?

A	20
B	40
C	160
D	320

Computer-NetworksControl-Flow-MethodsISRO-2018Video-Explanation

Question 953 Explanation:

Tt = L / B = 32 bytes/ 128 kbps = 32*8/128 ms = 2 ms
Round trip delay = 2 * Tp = 80 ms (given)
Optimal window size is = (T_t + 2*T_p) / T_t = 82 / 2 = 41
Option is not given, closest option is 40.

Correct Answer: B

Question 953 Explanation:

Tt = L / B = 32 bytes/ 128 kbps = 32*8/128 ms = 2 ms
Round trip delay = 2 * Tp = 80 ms (given)
Optimal window size is = (T_t + 2*T_p) / T_t = 82 / 2 = 41
Option is not given, closest option is 40.

Sunder Lal

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