Consider a path consisting of four nodes: A, B, C and D in a store-and-forward p

Question

Consider a path consisting of four nodes: A, B, C and D in a store-and-forward packet-switching network. The transmission rate of link (A, B) is s_1 bps, the transmission rate of link (B, C) is S_2 bps, and the transmission rate of link (C, D) is S_3 bps. The propagation delay of each link is d seconds. Assume that the processing delay at each node is zero. Assume that S_3 > S_1 > S_2. The packet size is p bits. Node A sends two packets back-to-back at times t_1 and t_2, respectively, to node D, meaning that t_2 = t_1 + p/s_1. a) When does node B receive the last bit of the first packet? b) When does node B receive the last bit of the second packet? c) When does node C receive the last bit of the second packet? d) When does node D receive the last bit of the second packet?

Explanation / Answer

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