Two hosts connect through one packet switch using $10^7$ bits/s links. Each link has 20 μs propagation delay. The switch begins forwarding a packet 35 μs after receiving it. Send 10000 bits in packets of 5000 bits, neglecting other delays. Find time from transmitting the first bit to receiving the last bit, in μs.
Each 5000-bit packet takes 500 μs to transmit. The first reaches the switch completely at 520 μs, starts forwarding at 555 and reaches the destination completely at 1075. The second reaches the switch at 1020, starts at 1055 when its processing is complete and the outgoing link is free, and finishes at the destination at 1575 μs.
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