Q. 23 Station A uses 32 byte packets to transmit messages to Station B using a sliding window protocol. The round trip delay between A and B is 80 milliseconds and the bottleneck bankwidth on the path between A and B is 128 kbps. What is the optimal window size that A should use ?
(A) 20
(B) 40
(C) 160
(D) 320
Answer: (B)
Explanation: 
