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Computer networking exercises

By abbasi
Sep 24, 2014
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  1. Hello all,

    I'm reading this (http://wps.pearsoned.com/ecs_kurose_compnetw_6/) networking book.
    The exercise no 13 of chapter one says:

    P13. (a) Suppose N packets arrive simultaneously to a link at which no packets are currently being transmitted or queued. Each packet is of length L and the link has transmission rate R. What is the average queuing delay for the N packets?

    (b) Now suppose that N such packets arrive to the link every LN/R seconds. What is the average queuing delay of a packet?


    I've obtained these for (a) and (b):

    (a): (N-1)/2 L/R sec.
    (b): For nth LN/R: [n(N-1)-2(n-1)]/2 L/R sec.

    1- Are these answers correct?
    2- Is here a correct place for posting such problems?
     
  2. jobeard

    jobeard TS Ambassador Posts: 9,336   +622

    My my; Network theory. Not to dampen your efforts, but unless there's a switch, knob, or parameter that can alter the outcome, there's little practical use of this kind of information IMO.

    As an example of a practical issue, the SACKOPTS paramater greatly improves TCP performance.
     
  3. abbasi

    abbasi TS Booster Topic Starter Posts: 307   +21

    My friend. It's just a homework! I posed it here to be sure whether the answers are correct or not. That's all. :)
     

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