Assignment on Files and Networks
CAS CS 552 - Fall 1999
November 19, 1999

Prof. Matta


Due: November 30, 1999. To be done individually. Submit a hard copy of your answers to the following questions:
     
  1. Do Chapter 11, Problem 14 (page 397 in Textbook).

    2.  
  2. Execute the following command on csa.bu.edu and explain the output in file "stat":

    3. /usr/sbin/ping -s cat.isi.edu 56 10 > stat
    Include the output with your answer. (Hint: type man ping.)
     
  3. When transferring a file between two computers, (at least) two acknowledgment strategies are possible. In the first one, the file is chopped up into packets, which are individually acknowledged by the receiver, but the file transfer as a whole is not acknowledged. In the second one, the packets are not acknowledged individually, but the entire file is acknowledged when it arrives. Discuss when one approach performs better than the other.

    4.  
  4. A transport protocol with window size of 65,535 bytes is used over a 1-Gbps link (10^9 bps) link that has a 10-msec one-way delay. What is the maximum throughput (data rate) achievable? What is the link utilization (percentage of time the link is busy)?

    5.