GATE 2024 CS (CS2) – Question 54

Computer Networks · TCP: Flow Control, Congestion Control, Socket API · 2 marks · Numerical answer

Consider a TCP connection operating with a congestion window of size 12 MSS when a timeout occurs due to packet loss. Assuming that all the segments transmitted in the next two RTTs are acknowledged correctly, the congestion window size (in MSS) during the third RTT will be _________

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Correct answer: 4

Explanation

On timeout, ssthresh = 12/2 = 6 and cwnd = 1. Slow start: RTT1 cwnd = 1, RTT2 cwnd = 2, RTT3 cwnd = 4.