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Consider an ARQ algorithm running over a 20-km point-to-point fiber link.
(a) Compute the propagation delay for this link, assuming that the speed of light is 2 × 10^8 m/s in the fiber.
(b) Suggest a suitable timeout value for the ARQ algorithm to use.
(c) Why might it still be possible for the ARQ algorithm to time out and retransmit a frame, given this timeout value?

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