ITPEC IP April 2022 Question 14
ITPEC IP April 2022 — Question 14 of 100
The availability order from highest to lowest is C, B, A. Configuration C has three devices in parallel, so the system remains operational while at least one device works. Configuration B places one device in series with two parallel devices; it fails if the single series device fails or if both parallel devices fail. Configuration A has two devices in series and fails when either one fails. For component availability between 0 and 1, parallel redundancy increases availability, while additional required series components decrease it.
Answer (d)
Why not others:
- A cannot rank highest because both of its series components must work
- B has some redundancy but still depends on its single series component
- C has no single component whose failure stops the system
Key rule: Series availability multiplies required component availabilities; parallel redundancy improves availability because only simultaneous failure of every parallel path stops service.
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