An organization is implementing a new data center that will house its mission-critical systems. The CISO wants to ensure the highest possible availability for the network infrastructure. Which of the following power designs would BEST meet this requirement?
A system with parallel power paths and separate utility feeds
A centralized power system with backup batteries
A system with spare capacity components
A backup generator system with transfer capability
The correct answer is a system with parallel power paths and separate utility feeds. This design represents what's known as 2N redundancy, which provides two completely independent power systems, each capable of handling the full load. This design eliminates single points of failure and allows for maintenance without impacting operations. In availability terms, this could help achieve 99.999% (five nines) or higher availability.
A centralized power system with backup batteries offers protection against short power outages but represents a single point of failure and would not provide the highest possible availability.
A system with spare capacity components provides what's known as N+1 redundancy, offering one extra unit beyond what is needed for normal operation. However, it doesn't offer the same level of protection as systems with completely redundant paths since components still share common elements.
A backup generator system with transfer capability requires active switching during failure scenarios, adding delay and potential for error, making it less reliable than automated redundant systems.
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ISC2 CISSP
Communication and Network Security
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