A data center's power architecture is designed to switch from the primary utility grid to an uninterruptible power supply (UPS) during an outage, and then transfer to a long-term generator before the UPS is depleted. What security principle does this design best exemplify?
Defense in depth
Segregation of Duties (SoD)
Fail-secure
Least privilege
The described power system uses multiple, layered controls to ensure availability, which is a classic example of the defense in depth principle. The layers consist of the primary utility power, the short-term battery backup (UPS), and the long-term generator power. Each layer provides redundant protection in case another layer fails.
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