Question 1 answer

This elementary problem begins to explore propagation delay and transmission delay, two central concepts in networking. Consider 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 send 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. Suppose d_prop is less than d_trans. At time t = d_trans, where is the first bit of the packet? g. Suppose s = 2.5* 10^8, L = 100 bits, and R = 28 kbps. Find the distance m so that d_prop equals d_trans