Multiple choice

What is the latency for a 5 MB message, if a bandwidth of the network is 1 Mbps. Assume that the distance between the sender and the receiver is 12,000 km and the light travels at 2.4 X 108 m/sec.

  1. 40.05 sec

  2. 42 sec

  3. 39.95 sec

  4. 41 sec

  5. 40 sec
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A Correct answer
Explanation

Latency= Propagation time + Transmission timePropagation Time=distance/propagation speedi.e propagation time=12000 * 1000/2.4 * 10^8 =0.05 secTransmission time=Message Size/Bandwidthi.e. transmission time=5*10^6*8/1*10^6 =40 sechence, latency=.05+40 =40.05sec

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