ITPEC IP April 2023 Question 14
ITPEC IP April 2023 — Question 14 of 100
A dual system runs the same processing on two computers and cross-checks their results to improve reliability. Because both systems operate in parallel, disagreement can reveal a fault, and the design can prevent an incorrect result from being accepted without detection. This is active redundancy rather than merely keeping a spare idle.
Answer (a)
Why not others:
- (b) describes a duplex or standby system with an active primary and backup secondary
- (c) describes peer-to-peer distributed processing
- (d) describes hierarchical distributed processing such as a client-server arrangement
Key rule: Dual systems actively duplicate and compare processing; standby systems normally use one system and switch to another after failure.
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