Question

6.0. suppose the path from A to B has a single switch S in between A───S───B....

6.0. suppose the path from A to B has a single switch S in between A───S───B. The per-link bandwidth and propagation delays are as follows:

link bandwidth propagation delay
A──S 5 bytes/µsec 24 µsec
S──B 3 bytes/µsec 13 µsec

(a). How long would it take to send a single 600-byte packet from A to B?

(b). How long would it take to send two back-to-back 300-byte packets from A to B? Note that, because the S──B link is slower, packet 2 arrives at S from A before S has finished transmitting packet 1 to B.

(c). Suppose in the previous exercise, the A–S link has the smaller bandwidth of 3 bytes/µsec, and the S–B link has the larger bandwidth of 5 bytes/µsec. The propagation delays are unchanged. Now how long does it take to send two back-to-back 300-byte packets from A to B?

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