Resilience is a system's ability to keep working, or recover quickly, when components fail. It supports availability, the A in the CIA triad. Hardware breaks, software crashes, power fails and attacks happen, so resilient designs remove single points of failure: any one component whose failure would stop the whole service. Security+ covers the main building blocks: high availability, clustering, load balancing, RAID, plus power resilience and platform diversity. You should be able to say which one addresses which failure.
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