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Security Fundamentals & Crypto · Foundational

Redundancy

Duplicating critical components so a backup takes over if one fails.

Definition

Redundancy can apply to power (dual supplies, UPS, generators), network links, storage (RAID), servers, and entire sites. It removes single points of failure and is the foundation of high availability. Geographic redundancy protects against regional disasters.

Example

A server has dual power supplies connected to separate PDUs on different circuits.

Exam tip

Redundancy without regular failover testing may fail when needed.

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