Test1-10-02-06 - CIS 3360 Security in Computing First...

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CIS – 3360 Security in Computing First Examination October 2, 2006 Fall 2006 Name __________________________________________________ Question 1 (5 + 5 = 10 points) Suppose there is a 12 Mbps microwave link between a geostationary satellite (36000 kilometers above Earth’s surface) and its base station on Earth. Every minute the satellite takes a digital photo and sends it to the base station. Assume a propagation speed of 2.4 * 10 8 meters/sec. (i) What is the propagation delay t prop of the link? Compute the result in milliseconds. (ii) What is the bandwidth-delay product in bytes, R * t prop ? Question 2 ( 5 + 6 + 5 + 6 = 22 points) Consider sending a large file of F bits from Host A to Host B. There are two links (and one router) between A and B, and the links are uncongested (that is, no queuing delays). Host A segments the file into segments of S bits each and adds 40 bits of header to each segments, forming frames of L = 40 + S bits. Each Link has a transmission rate of R bps.
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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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Test1-10-02-06 - CIS 3360 Security in Computing First...

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