hw1_spring10 - CS421, HW#1, due Mar. 25, 2010 1. I wrote...

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CS421, HW#1, due Mar. 25, 2010 1. I wrote down a UDP based ping program, which can send ping request packets of variable size, in order to measure the propagation delay and transmission rate to the nearest router. I made some measurements using this tool by pinging the nearest router from my computer: the router has a ping time of 2 ms for ping request packets of 125 Bytes long and 9 ms for ping request packets of 1000 Bytes long. Assume that ping reply packets are negligibly small and ignore all processing delays. What is the round-trip propagation delay and transmission rate of the link connecting my computer to the router? 2. Consider a 1 Mbits/sec connection with a 15 msec one-way propagation delay, i.e., 30 msec roundtrip propagation delay. We want to transfer a file of size 6600 Bytes. Each segment has a total size of 625 Bytes including the 25 Bytes header. When there is data to be transmitted, each segment contains the maximum number of bytes. Assume that ACK segments are negligibly small and there is a processing delay of 1 msec after a segment is fully received at the receiver until the transmission of the corresponding ACK is started. Assume that the processing delay at the sender after an ACK is received is negligible. Selective Repeat protocol is used with a window size of N = 5 segments. Assume that every 4 th segment crossing the forward channel is lost while ACKs are not lost or corrupted, and the timeout for
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This note was uploaded on 01/09/2012 for the course CS cs464 at Bilkent University.

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hw1_spring10 - CS421, HW#1, due Mar. 25, 2010 1. I wrote...

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