ITPEC IP April 2019 Question 16
ITPEC IP April 2019 — Question 16 of 100
A dual system uses two systems to perform the same processing, compares their results, and continues after isolating a failed side. Running the same work in parallel enables error detection through comparison and provides redundancy when one system fails.
Answer (a)
Why not others:
- (b) describes using two devices mainly for increased processing capacity, without result comparison or fault isolation
- (c) describes a duplex system with an active system and a standby system
- (d) describes a series arrangement whose failure tolerance is poor
Key rule: A dual system performs duplicate processing concurrently and compares results; a duplex system maintains a primary and a standby system.
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