ITPEC IP April 2021 Question 15
ITPEC IP April 2021 — Question 15 of 100
A dual system runs two systems in parallel, compares their results, and can isolate a failed side while continuing operation. The duplicate processing and result comparison are used for high reliability and fault detection rather than simply doubling normal throughput.
Answer (a)
Why not others:
- duplicate equipment does not guarantee exactly double performance
- an active online system with a standby backup describes a duplex system
- a serial arrangement with a single point of failure is neither a dual system nor highly fault tolerant
Key rule: Dual systems perform the same work simultaneously and compare results; duplex systems use an active and a standby system.
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