Q1. (25 pts) This elementary problem begins to explore propagation delay and tra

Question

Q1. (25 pts) This elementary problem begins to explore propagation delay and transmission delay, two central concepts in data networking. Consider two hosts, A and 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. Express the propagation delay, dpmog, in terms of m and s. a. Determine the transmission time of the packet, derons in terms of L and R b. Ignoring processing and queuing delays, obtain an expression for the end-to-end c. Suppose Host A begins to transmit the packet at time t-0. at time t-drans where is d. Suppose dprop is greater than drans. At time t-drans, where is the first bit of the e. Suppose dprop is less than drans. At time tedrans, where is the first bit of the packet? delay the last bit of the packet? packet? equals drans f. Suppose s-2.5*10 8, L-100 bits, and R-28 kbps. Find the distance m so that dprop

Explanation / Answer

The answers to the questions e and f are as below:

1.Since the dprop is greater than dtrans so the first bit has reached Host B.

2.Distance m can be represented as below:

m = L/R * s

now we have L = 100 bits, R = 28 kbps and s = 2.5 * 108

so the as per the formulae we have the folloiwng Distance which can be represented in m:

m = (100 / 28 * 1000) * s = (1/280) * s = 892.857 Km

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