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Give 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.
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The end to end delay of sending one packet of length L over N links of transmission rate R is N*L/R.  Since the delay is proportional to nos of Links and Length of packet L. Also it inversely proportional to transmission rate R.

For the same delay for such P packet is obviously will be P*N*L/R.

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