# hw2 - g. Suppose s = 2.5 * 10 8 , L = 100 bits, and R = 28...

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CIS 3360 Homework 2 Due Date: September 11(Monday) Worth: 3% Q 1 . This elementary problem begins to explore propagation delay and transmission delay, two central concepts in data networking. 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?
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Unformatted text preview: g. Suppose s = 2.5 * 10 8 , L = 100 bits, and R = 28 kbps. Find the distance m so that d prop is equal to d trans. Q 2 . Suppose two hosts, A and B, are separated by 10,000 kilometers. and are connected by a direct link of R =l Mbps. Suppose the propagation speed over the link is 2.5 * 10 8 meters/sec. a. Calculate the bandwidth-delay product, R * t prop . b. Consider sending a file of 400,000 bits from Host A to Host B. Suppose the file is sent continuously as one big message. What is the maximum number of bits that will be in the link at any given time? c. Provide an interpretation of the bandwidth-delay product. d. What is the width (in meters) of a bit in the link? Is it longer than a football field? e. Derive a general expression for the width of a bit in terms of the propagation speed s , the transmission rate R , and the length of the link m ....
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## This note was uploaded on 07/04/2011 for the course CIS 3360 taught by Professor Guha during the Fall '06 term at University of Central Florida.

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