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Suppose there are exactly two packet switches between a sending host and a receiving host. The transmission rate between the sending host and...

Suppose there are exactly two packet switches between a sending host and a
receiving host. The transmission rate between the sending host and switch#1 is R1. The
transmissions rate between switch#1 and switch#2 and between switch#2 and the
receiving host are R2 and R3, respectively. Assuming that the switches user store-and forward
packet switching, what is the total end-to-end delay to send a packet of length L?
(Ignore queuing, propagation delay, and processing delay.)

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