ITPEC FE Morning April 2019 Question 14
ITPEC FE Morning April 2019 — Question 14 of 80
Dual System — two identical systems run the same processing in parallel and compare results.
A dual system uses two computers that perform identical processing simultaneously. Results are cross-checked (collated) for accuracy. If one system fails, the other continues in degraded mode.
Why not others:
- (a) — describes hot standby: backup system waits on standby, switches over on failure
- (b) — describes a fault-tolerant system: all components (CPU, memory, power) are duplicated for seamless operation
- (d) — describes an active-standby split (online + batch), not true dual processing
Key rule: Dual system = same task on both machines + result comparison. It's about accuracy, not just redundancy.
AI-generated — may contain errors
The original exam layout is preserved in the image so diagrams, formulas, tables, and code remain accurate.
This question comes from an official ITPEC past paper. ITPEC Practice is an independent study tool and is not affiliated with ITPEC. See the official FE past-paper collection or Report an issue.