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Berkeley ELENG 122 - Homework Assignment 2

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EECS122 – Communication Networks – Spring 2000 Department of EECS – University of California at Berkeley Homework Assignment 2 Problem 1 (8/20): Subnetting For the network below, indicate the routing tables that routers R1 and R2 and the configuration addresses that devices A and K must have. A B C D E F G R1 R2 1 2 3 J K L 1 2 3 Internet The network uses subnetting and the devices have the following addresses: A: 128.32.15.31/24; F: 128.32.19.12/26; K: 128.32.112.11/24 R1(1): 128.32.15.33/24; R1(2): 128.32.112.8/26 R2(3): 128.32.112.71/24 If you use WORD, answer the questions on this form and mail it as an email attachment to wlr@eecs with the subject 122S01H2. If you use the pdf reader, answer the questions as a text email and send as indicated above. We need your anwers by February 12 at noon. Student Name: SID: emailProblem 2 (6/20): CIDR We consider a simple network configuration problem. The networks N1-N4 have the following sizes: N1: 3, N2: 20, N3: 10, N4: 50. Our network protocol uses 8-bit addresses. Select CIDR prefixes for these networks and specify the routing tables at routers R1 and R2. R1 R2 1 2 3 1 2 3 N4 N3 N1 N2Problem 3 (8/20): DELAYS In the network below we assume that all the links are used at 80% of their capacity. We adopt the rule of thumb we discussed in class that estimates the average queuing delay at each buffer to be approximately 4 transmission times. The 1Mbps links are over copper and are 2km long. The 10Mbps links are over fiber and are 40 km long. The 10kbps links are over free space and are 5km long. Many network links are not shown. The packets are 500 bytes long, on average. Calculate the average delay from A to D and from B to C. A D B C 10kbps 10kbps 10Mbps1Mbps 10Mbps10Mbps1Mbps


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Berkeley ELENG 122 - Homework Assignment 2

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