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University of Waterloo ECE 358 mdimic3112

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ECE 358 Final Exam, S’2012 © 2012 University of Waterloo Dept. of Electrical and Computer Engineering ECE 358 – Computer Networks Instructor: Sagar Naik Exam. Date and Time: August 07, 2012, 9:00 AM—11:30 AM Room: ...

ECE 358 Final Exam, S’2012 © 2012 University of Waterloo Dept. of Electrical and Computer Engineering ECE 358 – Computer Networks Instructor: Sagar Naik Exam. Date and Time: August 07, 2012, 9:00 AM—11:30 AM Room: PAC 6 Instructions  You have two hours and 30 minutes to complete the exam.  This is a closed book exam. You may use a calculator.  Answer all questions.  All the acronyms are common in computer networks, and those have been explained in class.  Should there be a need to make an assumption to answer a question, state your assumption and proceed. Student ID Student Name Signature Total = /55 All the best… Question Marks Question Marks Q1 /10/ /10 Q4 /12 Q2 /10 Q5 /05 Q3 /08 Q6 /10 ECE 358/ Final Exam/ Spring 2012 Page 2 of 11 2 Q1. General [10 marks] 1. What is a data communication protocol? 2. Identify two reasons for packets (data or control) without bit errors to be dropped in computer networks. 3. Identify two reasons for different packets (data or control) to encounter different delays between the same pair of source and destination in a multi-hop computer network. 4. The retransmission timers in TCP are estimated based on actual measurements of round-trip segment delays, whereas no measurement is performed to estimate retransmission timers in CSMA/CD and CSMA/CA protocols. What is the reason for such a philosophical difference in the estimation of timers? 5. Identify two concepts that make the internet scalable. 6. What is the advantage of using a random initial sequence number (ISN) in a TCP connection? 7. Explain how TCP level piggybacking enhances router performance. 8. What are three communication parameters sent in the option field of a TCP segment? 9. Write the four sources of delay encountered by an IP packet while moving from one router to another, and attribute them to routers and links. 10. What are the two general principles for correcting bit errors in computer networks? 11. Why does the slotted Aloha protocol give better throughput performance than the pure Aloha protocol?

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