ITPEC IP October 2020 Question 16
ITPEC IP October 2020 — Question 16 of 100
Availability descends in the order C, B, A. C has three identical devices in parallel and works if any one works. B has two parallel devices but also one device in series, creating a single point of failure. A has two devices in series and fails if either device fails.
Answer (d)
Why not others:
- parallel redundancy increases availability because multiple failures are required to stop that section
- a series connection decreases availability because every component must work
- therefore C must rank above B, and B above A
Key rule: For independent components, series availability is a product; parallel availability is one minus the probability that every parallel path fails.
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