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23 January, 07:26

Suppose there is exactly one packet switch between a sending host and a receiving host. The transmission rates between the sending host and the switch and between the switch and the receiving host are R1 and R2, respectively. Assuming that the switch uses store-and-forward packet switching, what is the total end-to-end delay to send a packet of length L?

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  1. 23 January, 08:50
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    End-to-end delay = L/R1 + L/R2

    Explanation:

    If we ignore propagation delay and processing delay (too small to be considered) and because the switch uses store-and-forward packet switching the time a packet will take from source to destination is the time the packet will take from source to switch (t1) plus the time the packet will take from switch to source (t2).

    The time can be calculated using the equation: time equal length over transition rate - > t = L/R

    t = t1 + t12

    t = L/R1 + L/R2
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