Question

Problem 1. RDT: Sender Utilization (20 pt.) Recall the example of sender utilization when assuming either stop-and-wait or pipelined protocols. Assume a 100 Mbps link with 50 msec propagation delay between two hosts. Also assume the packet length is 1,500 bytes. a. Calculate sender utilization (%) under the assumption of the stop-and-wait protocol. b. Calculate sender utilization (%) under the assumption of the pipelined protocol that can send 30 packets without acknowledgment.

Answer 1

a) Transmission Time = T_t =  

stop & wait    =

= 12000 * 10^-8

= 12 * 10^-5

= 0.12 msec

%

b) In pipelined protocol , we are sending 30 packets in ( T_p + T_t ) time

=

= 3.59 %

I have tried to explain it in very simple language and I hope that i have answered your question satisfactorily.Leave doubts in comment section if any.