414Assignment3

414Assignment3 - ECSE 414 Intro. to Telecom. Networks...

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ECSE 414 – Intro. to Telecom. Networks Assignment #3 - Fall 2010 13/10/10 M. Rabbat ECSE 414 - Homework Assignment #3 – Network Layer Due Tuesday, October 26, 2010 Note: Unless otherwise noted, all assignments are due at the beginning of the lecture period on the due date. For “paper and pencil” problems (such as Problems 1, 2, 3 and 4 below), you may submit a hard copy of your assignment in class or to the instructor’s mailbox, or you can submit your assignment electronically via WebCT. For programming problems (such as Problem 5), you must upload an archive file (e.g., zip, rar, or tgz) on WebCT containing the source code, executable (or .class file for Java applications), and a Readme file containing any special instructions for compiling and running your application. Problem 1 (4 marks) Provide a forwarding table for the rules defined in Table 1 below that uses longest prefix matching. Your solution should have four entries plus one “other” (five entries total). Destination Address Range Interface 11100001 00000000 00000000 00000000 to 11100001 00011111 11111111 11111111 0 11100001 00100000 00000000 00000000 to 11100001 00100000 11111111 11111111 1 11100001 00100001 00000000 00000000 to 11100001 10111111 11111111 11111111 2 Otherwise 3 Table 1: Mappings from Destination Address to Interface. Problem 2 (K&R Ch4, P17) (3 marks) Consider sending a 2400-byte datagram into a link that has an MTU of 700 bytes. Suppose the original datagram is stamped with the identification number 422. How many fragments are
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414Assignment3 - ECSE 414 Intro. to Telecom. Networks...

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