ITPEC IP April 2025 Question 14
ITPEC IP April 2025 — Question 14 of 100
Two systems perform the same processing and compare results — this is the defining redundancy of a dual system.
Both systems operate on the same work, allowing their results to be checked against each other. If one system fails, the faulty side can be isolated and processing can continue on the functioning system, improving reliability.
Answer (a)
Why not others:
- (b) describes parallel capacity expansion and incorrectly assumes exactly double performance
- (c) describes a duplex arrangement with an active system and a standby system doing other work
- (d) describes a serial pipeline with a single point of failure, not a redundant dual system
Key rule: A dual system runs duplicate processing for comparison; a duplex system keeps a separate backup system ready to take over.
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