Question

4.

[End-to-end Delay] What are the components of end-to-end delay for sending one packet of length L, over M back to back links, each of transmission rate Ri=R, for i=1,…,M?

You do not have any additional information available.

A. ML-R

B. ML/R

C. ML/R

D. MPL/R

Answer 1

Solution:

(4)

Given,

=>Number of packets = 1

=>Packet length = L

=>Number of links = M

=>Transmission rate of links = Ri = R where i = 1, 2, ...M

The answer will be an option,

(B) or (C) ML/R

Explanation:

Calculating tranmission delay at link 1:

=>Transmission delay = packet length/transmission rate

=>Transmission delay = L/R1

Calculating tranmission delay at link 2:

=>Transmission delay = packet length/transmission rate

=>Transmission delay = L/R2

Calculating tranmission delay at link M:

=>Transmission delay = packet length/transmission rate

=>Transmission delay = L/RM

Calculating total transmission delay:

=>Total tranmission delay = L/R1 + L/R2 + .... + L/RM

=>Total tranmission delay = L(1/R1 + 1/R2 + .... + 1/RM)

We know that R1 = R2 = ....= RM = R

=>Total tranmission delay = L(1/R + 1/R + ..... + 1/R)

=>Total tranmission delay = ML/R

Calculating end to end delay:

=>End to end delay = total transmission delay + total propagation delay + processing delay + queuing delay

=>End to end delay = ML/R + 0 + 0 + 0

=>End to end delay = ML/R

=>As options (b) and (c) are same so any of the options (b) or (c) is correct and other options (a) and (d) are wrong.

I have explained each and every part with the help of statements attached to it.