Read the following scenatio and then answer a-g below. (3 points) Scenario Consi
ID: 3748560 • Letter: R
Question
Read the following scenatio and then answer a-g below. (3 points)
Scenario
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 smeter/sec. Host A is to send a packet of size L bits to Host B.
Express the propagation delay, dprop, in terms of m and s.
Determine the transmission time of the packet, dtrans, in terms of L and R.
Ignoring processing and queuing delays, obtain an expression for the end-to-end delay.
Suppose Host A begins to transmit the packet a time t = 0. At time t = dtrans, where is the last bit of the packet?
Suppose dprop is greater than dtrans, At time t = dtrans, where is the first bit of the packet?
Suppose dprop is less than dtrans, At time t = dtrans, where is the first bit of the packet?
Suppose s = 2.5·108, L = 100 bits, and R = 28 Kbps. Find the distance m so that dpropequals dtrans.
Explanation / Answer
Answer a. Here the dprop = m/s sec.
Answer b. Here the transmission time is dtrans= L/R sec.
Answer c. expression for end to end delay is d = (m/s + L/R) sec.
Answer d. We can say about the last bit that it is just leaving the side that is Host A.
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