Computer Networks · Question 15 · Hard
Computer Networks question 15
A TCP sender has a congestion window of 16 MSS, with the whole window in flight, when a retransmission timeout occurs. Following standard TCP congestion control (Tahoe/Reno), what are the new ssthresh and cwnd?
- ssthresh = 16 MSS, cwnd = 8 MSS
- ssthresh = 8 MSS, cwnd = 8 MSS
- ssthresh = 4 MSS, cwnd = 1 MSS
- ssthresh = 8 MSS, cwnd = 1 MSS
Answer and explanation
Answer: D. ssthresh = 8 MSS, cwnd = 1 MSS
Explanation: On a timeout, ssthresh is set to half the data in flight (16 / 2 = 8 MSS) and cwnd drops to 1 MSS. The sender then restarts slow start. Setting cwnd to about ssthresh is the fast-recovery response to three duplicate ACKs, not to a timeout.
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