Folowing is the Congestion Control Window graph of TCP. What will happen if Congestion Window reaches to zero when timeout occurs ?enter image description here

  • $\begingroup$ On timeout, the TCP protocol executes the following three steps: (1) congestion window is reset to 1 MSS, (2) ssthresh is set to half the congestion window size before the timeout, and (3) slow start is initiated. You can see that according to this protocol, congestion window never reaches $0$ after a timeout. $\endgroup$ – zdm Sep 3 '18 at 22:14

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