You are designing a link layer protocol for a link with a bandwidth of 1 Gbps (109bits/second) over a fiber link with a length of 800 km. Assume the speed of light in this medium is 200000 km/second. What is the propagation delay in this link?
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Correct answer: D. 4 milliseconds
Explanation
800 km ÷ 200,000 km/s = 4 ms.
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