Your manager stated that her communication network needs to function nearly all
ID: 442891 • Letter: Y
Question
Your manager stated that her communication network needs to function nearly all the time. You have been designated to be the project manager to improve the reliability of the system. The current network has three routers that are in series and it includes a backup system with three identical routers. The reliability of each router in the system is 0.89, 0.86, and 0.84. What is the percentage of the time the current system is expected to be operational? When you tell her, she directs you to prepare an additional “backup” plan that will improve the reliability to 99% of the time. What is your response and your suggestion?
Explanation / Answer
The percentage of time the current system is expected to be operational is (0.89 + 0.86 + 0.84) / 3 = 86.33%
The back up plan should include routers with higher reliability so as to function nearly all the time even at the time of failure of one or two there should be enough back up to function.
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