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Suppose that the TCP congestion window is set to 18 KB and a timeout occurs. How
big will the window be if the next four transmission bursts are all successful? Assume
that the maximum segment size is 1 KB.
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when a timeout occurs, the sender will go to slow start phase

New threshold=$\frac{cwnd}{2}=\frac{18}{2}$=9 KB

cwnd=1 MSS=1 KB

first transmission(after timeout)=1 KB

Second transmission=2 KB

Third transmission=4 KB

Fourth transmission=8 KB

After 4 successful transmissions cwnd=8 KB
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