Answer to Question #247135 in Computer Networks for Ajith

Question

Two adjacent nodes P and Q use Go-Back-N sliding window protocol with 3-bit 

sequence numbers and a send window size of 7. What is the window position for P 

and Q by drawing the sequence diagram after :

 P sends all seven frames 0,1,2,3,4,5and 7 frames in the current window. Frame 

5 is lost.

 Q acknowledges frames 0,1,2,3,4, all the acks are received by P except for ack 

2 and ack 3.

Answer 1

Given,

Number of bit in the sequence number = 3

Window size = 7

Frame send by P = 0, 1, 2, 3,4, 5,7 from lost 5

Q acknowledges frame = 0,1,2,3,4 all received by P

except for acknowledge 2 and acknowledge 3