Suppose there are 2 routers in sequence between Host A and Host B, all of which

Question

Suppose there are 2 routers in sequence between Host A and Host B, all of which use store-and-forward routing. What is the total end-to-end delay for a packet originating from Host A with destination Host B, under the following conditions.

Each of the link transmission rates are 7.6 Mbps

The total distance from Host A to Host B along its path of transmisison is 115.1 km

The speed of propagation through the transmission medium is is 2.7 x 108 m/s

The packet size is 5 KiB

Remember that you must also uplink from Host A to the first router. Give answer in milliseconds, rounded to 1 decimal place.

Explanation / Answer

The route is very similar to
Host A---------Router1------------------Router2--------Host B

So total time teken would consist of:
   1 propagation delay (time taken for travelling the media)
   2 transmission time (the amount of time from the beginning until the end of a message transmission)

Propagation delay:
      distance travelled / speed of propagation
     = 115100 / 2.7 *108 = 42629629.63 * 10-8 mili sec

Transmssion delay:
     packet size / bandwidth
    = 5 / (7.6 * 1024) = 6.4248 * 10-1 mili sec

Considering the routers have zero (0) processing time
total time = Transmssion delay by host A + Transmssion delay by router1 + Transmssion delay by router2 + propagation time
          = 3 * ( 6.4248 * 10-1 ) + (42629629.63 * 10-8)
          = 1.92744 + 0.4262962963 ms
          = 2.3537362963 ms

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