# Midterm Exam CMPSCI 453: Computer Networks Fall 2011 Prof. Jim Kurose

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1 Midterm Exam CMPSCI 453: Computer Networks Fall 2011 Prof. Jim Kurose Instructions: There are 4 questions on this exam. Please use two exam blue books answer questions 1, 2 in one book, and the remaining two questions in the second blue book. Put your name and student number on the exam books NOW! The exam is closed book. You have 80 minutes to complete the exam. Be a smart exam taker - if you get stuck on one problem go on to another problem. Also, don't waste your time giving irrelevant (or not requested) details. The total number of points for each question is given in parenthesis. There are 100 points total. An approximate amount of time that would be reasonable to spend on each question is also given; if you follow the suggested time guidelines, you should finish with 5 minutes to spare. The exam is 80 minutes long. Show all your work. Partial credit is possible for an answer, but only if you show the intermediate steps in obtaining the answer. Good luck.

5 c) [10 points] Give a FSM description for the data requesting protocol at A. Answer: Note that R will be sending only a series of R(0)s followed by one or more R(1)s, followed by one or more (R(0)s, etc This makes A pretty simple: Problem 4. Sliding Window Protocols (19 points, 10 minutes) a) [3 points] Consider the sliding window protocol in Figure (4a) to the right. Does this figure indicate that Go-Back-N is being used, Selective Repeat is being used, or there is not enough information to tell? Explain your answer briefly. Answer: there is not enough information to tell, since both GBN and SR will individually ACK each of the first two messages as they are received correction. b) [3 points] Consider the sliding window protocol Figure (4b) to the right. Does this figure indicate that Go-Back-N is being used, Selective Repeat is being used, or there is not enough information to tell? Explain your answer briefly. Answer: This

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