Computer networks

CST 311 Instructor: Anand Seetharam Homework 1: Introduction to Networking Problem 1: This elementary problem begins to explore propagation delay and transmission delay, two central concepts in data networking. 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 dprop- in terms of m and s. b. Determine the transmission time of the packet, durans, 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 redtrans: where is the last bit of the packet? e. Suppose dpropis greater than durans At time tedtrans where isThe first bit of the packet? f. Suppose dprop is less than drans At timetdrans where is the first bit of the packet? g. Suppose s 25-108,Le 120 bits, and R= 56 kbps. Find the distance m so that dprop equals durars