hw1 - CS/ECE 438: Communication Networks Spring 2010...

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CS/ECE 438: Communication Networks Spring 2010 Problem Set 1 Due: start of class, Wednesday, February 3 rd Network Overview, Utilities and Basic Probability Assigned reading: Peterson and Davie: Chapter 1 All problems carry equal weight. To receive full credit, show all of your work. 1. Your company has a large data store to back up every week and you want to find the quickest possible way to get your backup off site. You have two choices: (1) use your high-speed internet connection and transfer all of the data over the internet or (2) copy your data to a flash drive and drive it over in your car. Your internet connection is over an OC3 line (155.52Mbps), and you copy to your flash drive via high-speed USB (480Mbps), each flash drive holds 32 GB and you live two hours away from your storage location. If you have 4TB of data to back up every week. Answer these two questions (a) How many flash drives would you need with option #1? (b) Which transmission method has the higher data rate? 2. Consider two machines, A and B, connected by a 1 Gbps Ethernet with four store-and-forward relay switches on the path between them. Suppose that no other machines are using the Ethernet, that each of the three links introduces a propagation delay of 3 μ s, and that a switch begins transmitting a packet immediately after receiving the last bit of the packet. a.
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hw1 - CS/ECE 438: Communication Networks Spring 2010...

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