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450_HW_1

# 450_HW_1 - EE 450 Homework 1 Summer 09 Nazarian Name...

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EE 450 Homework 1 Summer ’09 Nazarian Name: _________________________________________ Lecture 8:00 Assigned: Thursday June 4, 2009 Score: ________ Due: Thursday June 11, 2009, 8:00 am 1. (5 points) What is the difference between a host and an end system? List the types of end systems. Is a web server an end system? 2. (each part 5 points) (a) What is network topology? (b) Write at least 5 different topologies. (c) Which topology is the most expensive? 3. (each part 5 points) 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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