• Calculate the minimum timeout value for a stop-and-wait algorithm running over a 50-meter point-to-point copper link. Assume a minimum delay of 5 s at the receiver.
• If you know the distance between two points, you can calculate the speed-of-light latency, although you have to be careful because light travels across different media at different speeds: It travels at 3.0 10⁸m/s in a vacuum, 2.3 10⁸m/s in a copper cable, and 2.0 10⁸m/s in an optical fiber.