3 votes 3 votes Consider a scenario of GO-BACK-4 protocol with 10 bits sequence numbers. Assume that s is the sequence number of subsequent packet at time t0, Then what can be the possible range of window size at sender. Note: medium does not change the order of packets. [s,s+3] [s-9, s-1] [s-4, s-9] [s-4,s] Computer Networks computer-networks go-back-n + – Akriti sood asked Jan 1, 2017 Akriti sood 836 views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply saurabh rai commented Jan 1, 2017 reply Follow Share i m getting a. 0 votes 0 votes Akriti sood commented Jan 2, 2017 reply Follow Share yea..A is correct but whts wrong with D?? 0 votes 0 votes Akriti sood commented Jan 2, 2017 reply Follow Share answer can be [s-N,s-1] als..right?? 0 votes 0 votes Please log in or register to add a comment.
Best answer 1 votes 1 votes Window Size is 4. So, only A fits here. 1. [s, s+3] => (s, s+1, s+2, s+3) 2. [s-9, s-1] => contains 9 packets 3. [s-4, s-9] => contains 6 packets 4. [s-4, s] => (s-4, s-3, s-2, s-1, s) So option A is the correct answer. Pratyush Madhukar answered Jan 6, 2017 selected Jan 6, 2017 by Akriti sood Pratyush Madhukar comment Share Follow See all 2 Comments See all 2 2 Comments reply Akriti sood commented Jan 6, 2017 reply Follow Share but answer cn be [s-1,s-n] as suppose,we have sent a window [0,1,2,3] now next sequnce number is 4,but this frame will only be sent if acknowledgemt of 0th frame is recived.so suppose,we dun get ack of 0th frame,hence window will be still[0,1,2,3] 0 votes 0 votes Pratyush Madhukar commented Jan 6, 2017 reply Follow Share Ya, in that case [s-4, s-1] can also be the window, but since it wasn't mentioned in the options I didn't consider it. 0 votes 0 votes Please log in or register to add a comment.