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Assume a network that does not drop, duplicate, or corrupt any packets and that you are using a stop-and-wait protocol between two endpoints, A and B. The time it takes for a packet to get from A to B is uniformly distributed between 10 and 20ms. The time it takes for a packet to get from B to A is uniformly distributed between 20 and 30ms. The time it takes any packet to get from one endpoint to the other is independent of the time it takes any other packet.

You want to choose the timeout so that for each data packet that you send, 50% of the time you will not have to retransmit it due to a timeout. What is the largest possible timeout you can choose (in ms)?

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40 ms

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