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sion delay, two central concepts in data networking. Consider two hosts, A and B , connected by a single link of rate R bps .

sion 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 prpagation 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 endto-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,whe where is the first bit of the packet?
g. Suppose s=2.5*108,L=120 bits, and R=56kbps. Find the distance m so that dprop equals dtrans.
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