2 votes 2 votes If sender window size is 75 and we are using Go back -N protocol then what will be sequence number required and what is the value of N? A. 0 to 75 and 76 B. 0 to 74 and 75 C. 0 to 75 and 74 D. 0 to 74 and 76 mystylecse asked Sep 16, 2017 mystylecse 1.0k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
3 votes 3 votes In Go back N, N is the sender's window size. If window size is 75 means N= 75 Sender can send maximum of 75 packets which need 75 sequence no( unique sequence no to each packet), i.e, 0 to 74 Hence option B) is correct. Ashwani Kumar 2 answered Sep 16, 2017 Ashwani Kumar 2 comment Share Follow See all 2 Comments See all 2 2 Comments reply Warlock lord commented Sep 22, 2017 reply Follow Share You're wrong. None of the above is right. Number of sequence numbers should be at least one greater than sender window size in GBN. Thus 76 sequences will be needed (i.e 0-75) And as you said it goes back N times that is the window size and that's 75 The answer should be 0 to 75 and 75 2 votes 2 votes reena_kandari commented Oct 26, 2017 reply Follow Share for $75$ winddow size we need $8$ bits. so sequence number $0-255$ 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes 0 to N-1 is sender Sequence No and N is Window Size Neeraj Chandrakar answered Sep 16, 2017 Neeraj Chandrakar comment Share Follow See all 0 reply Please log in or register to add a comment.