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midterm2009 - ECSE 414 Intro to Telecom Networks Fall 2009...

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ECSE 414 – Intro to Telecom Networks – Fall 2009 Midterm Exam October 8, 2009 75 minutes, 65 marks Marks allocated to each question are indicated in square brackets. Include all work and computations in your solution. Read each of the questions and instructions carefully. This exam is closed book and closed notes . You are permitted to use a university approved calculator. Question 1 [30 marks] Provide short answers to the following questions. The number of marks indicates the number of “points” you should include. For example, in response to (a) you should provide two key differences. You can write in bullet form, but do not make the bullets cryptic. a) What are the key differences between the telephone network and the Internet in terms of underlying architectural design principles? [2] b) What are the advantages and disadvantages of statistical multiplexing over time-division multiplexing? [3] c) What are two ways that having a local web cache improves the average download time? [2] d) How often do root DNS servers receive requests, relative to the total number of DNS requests generated across the internet? Why? [3] e) What pieces of information define a TCP flow? [2] f) What is the bandwidth-delay product? What are its units? [3] g) Suppose you operate a network at your cottage up in the woods, and your local DNS server connects to the rest of the Internet over a 54 kbps dialup modem. Would you prefer to use
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  • Fall '10
  • Rabbat
  • Transmission Control Protocol, Domain Name System, data bits, persistent HTTP connection, single persistent HTTP, single non-persistent HTTP

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