# Computer networking exercises

By abbasi
Sep 24, 2014
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.

2- Is here a correct place for posting such problems?

2. ### jobeardTS AmbassadorPosts: 9,683   +674

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. ### abbasiTS BoosterTopic StarterPosts: 316   +23

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