Consider a path with k + 1 nodes: a source host, a destination host and k - 1 intermediate routers, linked by k transmission links of bandwidth W bits/second each. The propagation delay over each link is seconds. Processing and queueing delays at intermediate nodes are all negligible. no errors happen and no packets are ever lost. The source has an infinite queue of messages to be transmitted to the destination. Each message consists of L bits of user data