GATE CSE 2024 | Set 2 | Question: 44

Question

Consider a $\text{TCP}$ connection operating at a point of time with the congestion window of size $12$ $\text{MSS}$ (Maximum Segment Size), when a timeout occurs due to packet loss. Assuming that all the segments transmitted in the next two $\text{RTTs}$ (Round Trip Time) are acknowledged correctly, the congestion window size (in $MSS$) during the third $\text{RTT}$ will be __________.

Answer 1

Given cwnd = 12 MSS

Now timeout occurs which makes,

cwnd=1 and ssthreshold = 12/2= 6 MSS

Again slow start phase will begin,

After 1 RTT, cwnd = 2MSS

After 2 RTT, cwnd = 4MSS

During 3rd RTT cwnd will be 4 MSS.

Answer 2

 

Note: Time Out occur due to congestion in the network....