Computer Science CSCI 43600 Lecture Notes - Lecture 7: Network Congestion, Network Layer, Transmission Control Protocol
1 Mar 2018
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Review the car-caravan analogy in section 1. 4. Recitation class problems: suppose the caravan travels 150 km, beginning in front of one tollbooth, passing through a second tollbooth, and finishing just after a third tollbooth. What is the end-to-end delay: repeat (a), now assuming that there are eight cars in the caravan instead of ten. Tollbooths are 75 km apart, and the cars propagate at 100km/hr. A tollbooth services a car at a rate of one car every 12 seconds: there are ten cars. It takes 120 seconds, or 2 minutes, for the first tollbooth to service the 10 cars. Each of these cars has a propagation delay of 45 minutes (travel 75 km) before arriving at the second tollbooth. Thus, all the cars are lined up before the second tollbooth after 47 minutes. The whole process repeats itself for traveling between the second and third tollbooths. It also takes 2 minutes for the third tollbooth to service the 10 cars.
