What is the total delay associated with sending a 2000 B packet on a 1,000km lin

Question

What is the total delay associated with sending a 2000 B packet on a 1,000km link with a propagation speed of 2*10^8 m/s and a transmission rate of 10Mb/s? (Ignore queueing and processing delays) Now suppose instead of a single 1,000km link there are three 500km links connected by store-and-forward routers. Assuming the propagation speed and transmission rate are the same as before what is the total delay for a 2000 B packet? The picture looks like this (S is the source, D is the destination and R1 and R2 are the two routers.) S rightarrow R1 rightarrow R2 rightarrow D Now suppose a second source S2 sends to R1 over a separate link having the same speed as the S rightarrow R1 link. The packets from S2 are also destined for D. How will the delay change relative to question 7? Why? What assumption do you have to make to ensure that no packets are lost?

Explanation / Answer

6) Per given question,

Queuing and Processing Delay can be ignored.Hence,

Propagation Delay = Distance/Speed

= 1*107/2*108

= 0.05 sec

Transmission Rate = 10 Mbps

Bandwidth Delay = Transmission Rate * Propagation Delay

= 1*106 * .05 = 5*104 bits

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