Assume stop-and-wait, 100 Mbps link, 10 ms propagation delay, 10,000 bit packet. Calculate sender utilization. Assume...
- Assume stop-and-wait, 100 Mbps link, 10 ms propagation delay, 10,000 bit packet. Calculate sender utilization.
- Assume pipelining and 20 packets can be sent without ACK, 100 Mbps link, 10 ms propagation delay, 10,000 bit packet. Calculate sender utilization.
Homework Answers
a.
Given that bandwidth = 100 Mbps = 100 * 10^6 bits/sec
Length of the packet = 10, 000 bits
So, transmission delay(Tt) = length / bandwidth = 10000/(100* 106) = 0.0001 sec = 0.1 ms
and propagation delay(Tp) is given as 10 ms.
So, sender utilization / efficiency = Tt / (Tt + 2*Tp) = 0.1 / ( 0.1 + 2*10) = 0.1 / (20.1) = 0.499 %
b.
Transmission delay (Tt) = length / bandwidth = 10000/(100* 106) = 0.0001 sec = 0.1 ms
Propagation delay ( Tp) = 10 ms.
And number of packets(N) at a time given is 20.
Then a is (Tp/Tt) = 100
So, sender utilization / efficiency = N / ( 1 + 2a) = 20 / ( 1 + 2*100) = 20/ 201 = 9.95 % efficiency
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