Consider the figure below, which draws the analogy between store-and-forward link transmission and propagation of bits in packet along a link, and cars in a caravan being serviced at a toll booth and then driving along a road to the next tollbooth. Suppose the caravan has 10 cars, and that the tollbooth services (that is, transmits) a car at a rate of one car per 1 seconds. Once receiving serving a car proceeds to the next tool both, which is 400 kilometres away at a rate of 10 kilometres per second. Also assume that whenever the first car of the caravan arrives at a tollbooth, it must wait at the entrance to the tollbooth until all the other cars in its caravan have arrived and lined up behind it before being serviced at the toll booth. (That is, the entire caravan must be stored at the tollbooth before the first car in the caravan can pay its toll and begin driving towards the next tollbooth). Once a car enters service at the tollbooth, how long does it take until it leaves service? How long does it take for the entire caravan to receive service at the tollbooth (that is the time from when the first car enters service until the last car leaves the tollbooth)? Once the first car leaves the tollbooth, how long does it take until it arrives at the next tollbooth? Once the first car leaves the tollbooth, how long does it take until it enters service at the next tollbooth?

Principles of Information Systems (MindTap Course List)

13th Edition

ISBN:9781305971776

Author:Ralph Stair, George Reynolds

Publisher:Ralph Stair, George Reynolds

Chapter6: Networks And Cloud Computing

Section: Chapter Questions

Problem 6SAT

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Consider the figure below, which draws the analogy between store-and-forward link transmission and propagation of bits in packet along a link, and cars in a caravan being serviced at a toll booth and then driving along a road to the next tollbooth.

Suppose the caravan has 10 cars, and that the tollbooth services (that is, transmits) a car at a rate of one car per 1 seconds. Once receiving serving a car proceeds to the next tool both, which is 400 kilometres away at a rate of 10 kilometres per second. Also assume that whenever the first car of the caravan arrives at a tollbooth, it must wait at the entrance to the tollbooth until all the other cars in its caravan have arrived and lined up behind it before being serviced at the toll booth. (That is, the entire caravan must be stored at the tollbooth before the first car in the caravan can pay its toll and begin driving towards the next tollbooth).

Once a car enters service at the tollbooth, how long does it take until it leaves service?
How long does it take for the entire caravan to receive service at the tollbooth (that is the time from when the first car enters service until the last car leaves the tollbooth)?
Once the first car leaves the tollbooth, how long does it take until it arrives at the next tollbooth?
Once the first car leaves the tollbooth, how long does it take until it enters service at the next tollbooth?

...
400 km
400 km
10 car caravan
toll booth
toll booth
toll booth
(aka 10-bit packet) (aka link)

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