00:01
In this question, there are two subparts given and we have to answer one by one each part.
00:04
So the first one is the gobackerror protocol which uses a sliding window approach for flow control.
00:10
So the center window size is 3 which means that it can spend up to 3 acknowledged packets at a time and the sequence number range is 1024 which means the sequence numbers can range from 0 to 1023.
00:26
So if at time t, the next in order packet that receiver is expecting has a sequence number of k, the possible sets of the sequence numbers inside the centers with window at a time t are the contiguous sequence numbers that include k and extend up to the 3 packets ahead.
00:49
So the 3 packets is k, k plus 1, k plus 2, k minus 1, k, k plus 1 and third one is k minus 2, k minus 1, k.
00:58
Now the b part is the gobackerror protocol acknowledgements not just to receive the individual packets but receive to all the packets to a certain sequence number...