Computer Networking: A Top-Down Approach, 8th Edition

Three hosts, A, B, and C, are connected to a router, R.

A ------------ R ------------ C

|

B --------------+

The link from Host A to router R has bandwidth 100 Mb/s and propagation delay 5 ms. The link from B to R has bandwidth 1 Gb/s and propagation delay 10 ms. The link from R to C has bandwidth 10 Mb/s and propagation delay 5 ms.

Host A starts sending a packet of 3 * 10³ bits at time 0 seconds. Host B starts sending a packet of 10 * 10³ bits at time 2 ms. Router R is a store and forward switch with negligible processing delay.

a. Which packets initial bits are received first by R?

b. Which packet is completely received first by R?

c. When does the first packet arrive at host C?

d. When does the last packet arrive at host C?