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.
(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?
(b) Determine the transmission time of the packet, dtrans, in terms of L and R.
(e) Suppose dprop is greater than dtrans. At time t=dtrans; where is the first bit of the packet?
Suppose dprop is less than drans. At time t=d trans, where is the first bit of the packet?
(c) Ignoring processing and queuing delays, obtain an expression for the end-to-end delay.
(a) Express the propagation delay, d prop; in terms of m and s.
(g) Suppose s=2.5 * 10°, L=120 bits and R=56 kbps. Find the distance, m, so that dprop equals dtrans -
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