EE3015 Tutorial 2 (Delay and Protocol Layering) Review Questions y What are the seven layers in the OSI model? y What are the five layers in the Internet protocol model? y What are the four most important types of delay in a computer network? Problems 1. Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts are separated by m meters, and suppose the propagation speed along the link is s meters/sec. Host A is to send a packet of size L bits to Host B. a) Express the propagation delay, d prop , in terms of m and s . b) Determine the transmission time of the packet, d trans , in terms of L and R . c) Ignoring processing and queuing delays, obtain an expression for the end-to-end delay. d) Suppose Host A begins to transmit the packet at time t = 0. At time t = d trans , where is the last bit of the packet? e) Suppose d prop is greater than d trans . At time t = d trans , where is the first bit of the packet? f)
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