P6.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, dtrans, 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=dtrans, where is the last bit of the packet? e. suppose dprop is greater than dtrans. at time t=dtrans, where is the first bit of the packet? f. suppose dprop is less than dtrans. at time t=dtrans, where is the first bit of the packet? g. suppose s=2*109, l=1024 bits, and r=256 kbps. find the distance m so that dprop equals dtrans. solution: