a) A packet enters a router. Assume the router spends 0.01ms processing the packet. The router spends 0.025ms finding the correct entry on the forwarding table for the packet. The packet queues behind 4 other packets, where each packet takes 0.2ms to be sent. The router transmits the packet down a link of bandwidth 10Mbps. The link is 2000km long. Assume the propagation speed is 2x108m/s.  i) Name the four sources of delay in the network.

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