** Do not post a formula as an answer **

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 in terms of m and s. b. Determine the transmission time of the packet, transmission delay 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 = transmission delay where is the last bit of the packet? e. Suppose propagation delay is greater than transmission delay. At time t = transmission delay, where is the first bit of the packet? f. Suppose propagation delay is is less than transmission delay. At time t = transmission delay, where is the first bit of the packet? g. Suppose s = 2.5 10^8, L = 120 bits, and R = 56 kbps. Find the distance m so that propagation delay equals transmission delay.