ITPEC IP April 2022 Question 15
ITPEC IP April 2022 — Question 15 of 100
Measures (1) and (4) allow normal operation to continue when part of the system fails. Mirroring stores the same data on two hard disks, so the surviving disk can continue serving data after one disk fails. Redundant power supplies and an uninterruptible power supply similarly provide an alternative power path or temporary power when a component or commercial supply fails.
Answer (b)
Why not others:
- (2) reducing maintenance frequency does not add a component that takes over after failure and may instead increase risk
- (3) combining redundant communication lines into one high-speed line removes independent paths, so a failure of that one line stops communication
Key rule: Fault tolerance requires redundancy or an alternate resource that preserves service after a failure; efficiency or reduced maintenance alone does not provide failover.
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