1. Assume the following parameters for rdt 2.1 (7 points) a) Round Trip Time (RT

Question

1. Assume the following parameters for rdt 2.1 (7 points) a) Round Trip Time (RTT)10 ms b) A segment is 1500 bytes. Suppose that Bob sends 4 segments to Alice using rdt 2.1. Suppose that the third segment reaches Alice with errors when it is sent the first time, but reaches Alice correctly when it is sent the second time. All other segments reach Alice correctly in their first attempts. What is the average throughput obtained in sending all the segments (in bytes/sec)? Draw a diagram to show your work.

Explanation / Answer

For each link, it takes 1 Gigabits/5Kb = 5 micro seconds to transmit the packet on the link, after which it takes an additional 10 micro seconds for the last bit to propagate across the link. Thus, with only one switch that starts forwarding only after receiving the whole packet, the total transfer delay is two transmit delays + two propagation delays = 30 microseconds.

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