Computer Networking : A Top-Down Approach

Computer Networking : A Top-down Approach

Authors: James F. Kurose, Keith W. Ross
ISBN: 9780132856201
Edition: 6
Chapter: Computer Networks And The Internet
Exercise: Problems
Question: 2


Question by Anonymous on 29 Sep, 2016 at 12:31 PM

Equation 1.1 gives a formula for the end-to-end delay of sending one packet

of length L over N links of transmission rate R. Generalize this formula for sending P such packets back-to-back over the N links.

Answer by Geroge on 11 Nov, 2018 at 12:52 PM

Consider the given data

           N = Total number of links

           R = Transmission rate

           L = Packet length

           P = packets that tramnsmit over the N link

The following is the formula of back-to-back delay of sending P packets, each of length L over N links of transmisson rateR=d_{back-to-back}=PN\left ( \frac{L}{R} \right )

0 1


Cml Cgdm on 11 Nov, 2018 at 12:59 PM

first packet's delay N\frac{L}{R}  but, consecutive packet's delay would be \frac{L}{R} , because they are not at the beginnig. They are at the router just before the final host. When a packet comes to final destination, at the same time next packet come to the router previous packet left. Then formula would be N\frac{L}{R}+(P-1)\frac{L}{R}  . First term for the first packet and second term is for remaining packets.

Trueman on 09 Feb, 2019 at 05:05 AM

Yes this is the correct formula,  N\frac{L}{R}+(P-1)\frac{L}{R}

Post the discussion improve the above solution.