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CS 5480/6480: Computer Networks – Spring 2012 …

CS 5480/6480: Computer Networks Spring 2012 Homework 4 Solutions Due by 1:25 PM on April 11th 2012 Important: The solutions to the homework problems from the course book have been provided by the authors. CS5480 total points : 31 CS6480 total points : 40 Question 1 (Slotted Aloha) 5 points ( points for each part): Suppose four active nodes nodes A, B, C and D are competing for access to a channel using slotted ALOHA. Assume each node has an infinite number of packets to send. Each node attempts to transmit in each slot with probability p. The first slot is numbered slot 1, the second slot is numbered slot 2, and so on. a. What is the probability that node A succeeds for the first time in slot 5? b. What is the probability that some node (either A, B, C or D) succeeds in slot 4? c. What is the probability that the first success occurs in slot 3?

Question 2 (Ethernet) 6 points (2 points for each part): Consider the figure below.Now we replace the router between subnets 1 and 2 with a switch S1, and label the router between subnets 2 and 3 as R1. a. Consider sending an IP datagram from Host E to Host F.

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