Answer to Question #247134 in Computer Networks for Ajith

Question

 Two adjacent nodes A and B use the Go-Back-N sliding window protocol with 5-bit 

sequence numbers and a send window size of 10. We assume that A is transmitting to

B. What is the window position for A and B by drawing the sequence diagram after :

 A sends frames 0,1,2,3,4,5,6,7,8, frames 5 and 8 are lost.

 B acknowledges frames 0,1,2,3 and 4,the acks for 1 and 3 are lost

 The acks for 0,2,4 are received by A.

Answer 1

Given,

Number of bit in the sequence number = 5

Window size = 10

Frame send by A = 0, 1, 2, 3,4, 5,7,8 from lost 5 and 8 lost

B acknowledges frame = 0,1,2,3,4 all received by A

except for acknowledge 1 and acknowledge 3

The acks for 0,2,4 are received by A.