soln3.pdf - UNIVERSITY OF CALIFORNIA DAVIS BERKELEY DAVIS IRVINE LOS ANGELES RIVERSIDE SAN DIEGO SAN FRANCISCO SANTA BARBARA SANTA CRUZ EEC 173A\/ECS

soln3.pdf - UNIVERSITY OF CALIFORNIA DAVIS BERKELEY DAVIS...

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UNIVERSITY OF CALIFORNIA, DAVIS ______________________________________________________________________________________ BERKELEY DAVIS IRVINE LOS ANGELES RIVERSIDE SAN DIEGO SAN FRANCISCO ______________________________________________________________________________________ _________________________________ SANTA BARBARA SANTA CRUZ _________________________________ EEC 173A/ECS 152A-Computer Networks Spring 2018 Homework #3 Solution 1.(10 points)Stop-and-wait.(a)(4 pt.) What is the main short-coming of the stop-and-wait algorithm for error recovery? (b)(6 pt.) Given a 1.5 Mbps (Megabits per second) link with a 30 usec (microseconds) round-trip delay. With a frame size of 1KB (KiloBytes), what is the link utilization using the stop-and-wait algorithm? 2.(30 points)Performance of Stop & Wait, Go-Back-N, and Selective Repeat. Suppose the bandwidth on a point-to-point link to moon is 1 Mbps and the one-way propagation delay is 1 second. Assume that size of each packet is 125 bytes. Answer the following for each ARQ scheme: stop-and-wait, go-back-n and selective-repeat? (a)(9 pt.) Assuming that the link is error-free, what is maximum rate of transmission achievable from earth to moon? (Assume zero queuing delay, and assume zero transmission time for ACK packets).