{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Computer Science 162 - Spring 2001 - Joseph - Final

Computer Science 162 - Spring 2001 - Joseph - Final - CS162...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
CS162 Final, Spring 2001 CS 162 Final Spring 01 Problem 1 . (22 points total) Short Answer. a. T/F and Why (9 points) Circle the correct answer and provide a short, one-sentence reason for your answer. i) Adding a cache never hurts performance. ii) Unlike public key encryption, using private key encryption requires that the two communicating parties sharing a secret key ahead of time. iii) The optimal place on the disk for directory blocks in the innermost cylinder of the disk. b. (9 points) Assume the queue of disk blocks that the file system must write out contains blocks located on the following cylinders: 45, 18, 20, 10, 50 Assume the disk head just wrote a block on cylinder 15 and is currently over cylinder 16. List the order will blocks be written out with: i) FIFO: ii) Shortest Seek Time First: iii) SCAN / Elevator: c. (4 points) network file systems use server-callback or client-poll validation schemes for cached data. i) Which one does NFS use? ii) Which one does AFS use? Problem 2 . (18 points total) Networking. a. (10 points) Shown below is network configuration for each router's table. The network link marked with an X becomes unavailable. Fill in the final state for each router's table that results after multiple rounds of exchange between the routers. file:///C|/Documents%20and%20Settings/Jason%20Raftery/My%20Documents/U...0Science%20162%20-%20Spring%202001%20-%20Joseph%20-%20Final%20Exam.htm (1 of 7)1/27/2007 5:34:23 PM
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
CS162 Final, Spring 2001 A Table A B C D E Initial Distance 0 1 2 2 3 Out link - B B B B Final Distance Out link B Table A B C D E Initial Distance 1 0 1 1 2 Out link A - C D D Final Distance Out link C Table A B C D E Initial Distance 2 1 0 2 1 Out link B B - E E Final Distance Out link D Table A B C D E Initial Distance 2 1 2 0 1 Out link B B E - E Final Distance file:///C|/Documents%20and%20Settings/Jason%20Raftery/My%20Documents/U...0Science%20162%20-%20Spring%202001%20-%20Joseph%20-%20Final%20Exam.htm (2 of 7)1/27/2007 5:34:23 PM
Image of page 2
CS162 Final, Spring 2001 Out link E Table A B C D E Initial Distance 3 2 1 1 0 Out link C C C D - Final Distance Out link b. (8 points). Your new boss at Megasoft Corporation proposes a new sliding window-based reliable network transport protocol. The protocol works as follows: instead of sending an acknowledgement for eery packet, it only sends an acknowledgement for every 4 packets (by sequence number). Thus ACK #1 is sent when packets with sequence numbers 0-3 have been received. ACK #2 is sent when packets with sequence 4-7 have been received.
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern