Computer Networks

For a 1-Gbps network operating over 4000 km, the delay is the limiting factor, not the bandwidth. Consider a MAN with the average source and destination 20 km apart. At what data rate does the round-trip delay due to the speed of light equal the transmision delay for a1-KB packet ?

A.	24 Mbps
B.	36 Mbps
C.	40 Mbps
D.	48 Mbps
	Answer : C Explanation : Speed ight in fiber and copper = 200 km/msec. For a 20-km line, the delay is 100 μsec one way and 200 μsec round trip. A 1 KB packet has 8192 bits. If the time to send 8192 bits and get the acknowledgement is 200 μsec, the transmission and propagation delays are equal. If B is the bit time, then 8192 = 2 x 10^-4 sec. Data rate, 1 / B = 40 Mbps. (approx) Write your comments here: Updating your Comments.. Updating your Comments.. Report Error
	Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here.

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Computer Networks

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