3213_Midterm_Fall2010_solutions

3213_Midterm_Fall2010_solutions - Department of Computer...

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1 Department of Computer Science and Engineering CSE 3213: Communication Networks (Fall 2010) Instructor: N. Vlajic Date: Nov 2, 2010 Midterm Examination Instructions: Examination time: 75 min. Print your name and CS student number in the space provided below. This examination is closed book and closed notes. Calculator and one-sided cheat-sheet containing formulas only are allowed. There are 7 questions. The points for each question are given in square brackets, next to the question title. The overall maximum score is 100. Answer each question in the space provided. If you need to continue an answer onto the last page, clearly indicate that and label the continuation with the question number. FIRST NAME: ___________________________ LAST NAME: ___________________________ STUDENT #: ___________________________ Question Points 1 / 20 2 / 18 3 / 12 4 / 15 5 / 15 6 / 20 Total / 100
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2 1. Multiple Choice [20 points] time: 20 min Circle the letter beside the choice that is the best answer for each question. For each question choose only ONE answer. (1.1) In a __________________ network configuration (i.e., topology), there exists a direct dedicated connection per each pair of computers (a) bus (b) ring (c) mesh (d) star (1.2) Which of the following are considered to be advantage of circuit-switched over packet- switched networks? (a) in-order packet delivery (b) better network and/or connection survivability in case of individual switch/router failure (c) smaller blocking probability (i.e. probability that a request for service gets rejected) (d) none of the above (1.3) Which of the following is NOT correct in TCP/IP architecture? (a) A TCP packet is encapsulated in an IP packet. (b) A UDP packet is encapsulated in a TCP packet. (c) A UDP packet is encapsulated in an IP packet (d) An HTTP packet is encapsulated in an IP packet. (1.4) Assume two web-browser applications on Computer A (applications A-1 and A-2) are communicating with the same web-server application on Computer B (application B-1). Which of the following must be true: (a) A-1 and A-2 use the same port number, as they run on the same computer and exchange packets with the same server application (b) all three applications (A-1, A-2, B-1) use the same port number (c) the port numbers of A-1 and A-2 are different from each other, but one must be the same as the port number of B-2 (d) the port numbers of all three applications (A-1, A-2, B-1) are likely different from each other
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3 (1.5) What is the phase shift ( ϕ ) of a sinewave with the minimum amplitude at time zero. (a)
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3213_Midterm_Fall2010_solutions - Department of Computer...

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