CISA · Question #176
Which of the following system redundancy configurations BEST improves system resiliency and reduces the possibility of a single cause of failure impacting system dependability?
The correct answer is C. Diverse redundancy. Diverse redundancy (C) uses components from different vendors, technologies, or design approaches to achieve fault tolerance. Because the redundant components are not identical, a single bug, vulnerability, or failure mode is unlikely to affect all of them simultaneously - this e
Question
Which of the following system redundancy configurations BEST improves system resiliency and reduces the possibility of a single cause of failure impacting system dependability?
Options
- AActive redundancy
- BHomogeneous redundancy
- CDiverse redundancy
- DPassive redundancy
How the community answered
(41 responses)- A2% (1)
- C95% (39)
- D2% (1)
Explanation
Diverse redundancy (C) uses components from different vendors, technologies, or design approaches to achieve fault tolerance. Because the redundant components are not identical, a single bug, vulnerability, or failure mode is unlikely to affect all of them simultaneously - this eliminates common-cause or common-mode failures. Homogeneous redundancy (B) uses identical components, meaning a single software bug, hardware defect, or security vulnerability could simultaneously compromise all redundant instances. Active redundancy (A) means multiple components run concurrently but does not address whether they share failure modes. Passive (standby) redundancy (D) activates backup components on failure but also does not inherently protect against a common cause of failure.
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