EECS122 Communication Networks Spring 2000 Department of EECS University of California at Berkeley Homework Assignment 2 Student Name SID email 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 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 1 R1 3 J K L F G 2 1 R2 2 3 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 Internet Problem 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 N2 1 N1 R1 3 N3 2 1 R2 3 2 N4 Problem 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 B A 10kbps 10Mbps 1Mbps 10Mbps 10Mbps 1Mbps 10Mbps 10kbps C D
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