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Unformatted text preview: CS 118 Spring 2008 : Homework 1 Problem 1 Problem 1 Consider two hosts A and B , connected by a single link of rate R bps. Suppose that the two hosts are separated by m meters, and suppose the propagation speed along the link is s meters/sec. Host A is to send a packet of size L bits to Host B . a Express the propagation delay, d prop , in terms of m and s . b Determine the transmission time of the packet, d trans , in terms of L and R . c Ignoring processing and queuing delays, obtain an expression for the end-to-end delay. d Suppose Host A begins to transmit the packet at time t = 0. At time t = d trans , where is the last bit of the packet? e Suppose d prop is greater than d trans . At time t = d trans , where is the first bit of the packet? f Suppose d prop is less than d trans . At time t = d trans , where is the first bit of the packet? g Suppose s = 2 . 5 · 10 8 , L = 100 bits, and R = 28 kbps. Find the distance m so that d prop equals d trans ....
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This note was uploaded on 04/28/2010 for the course CS 118 taught by Professor Chu during the Spring '08 term at UCLA.
- Spring '08