Certified Data Centre Professional (CDCP) Practice Exam

A Rated-3 Data Centre is designed to allow maintenance to be performed without shutting down the critical systems. This rating indicates that there are redundant components and distribution paths, meaning that one path can be taken offline for maintenance while still providing power and cooling through an alternate path.

This capability is essential for organizations that require high availability; it enables them to carry out necessary maintenance of the infrastructure without disrupting operations. The design of a Rated-3 facility provides a balance of reliability and maintainability, ensuring that critical systems remain operational during scheduled and unscheduled maintenance activities.

Other ratings differ in their capabilities and redundancies. A Rated-1 facility typically has no redundancy, meaning maintenance often requires a complete shutdown. A Rated-2 facility has some redundancy but may still necessitate shutting down certain systems for maintenance, thus not providing the same level of operational continuity as a Rated-3 data center. A Rated-4 data center offers even higher redundancy and fault tolerance, but the correct answer reflects the capability of maintaining operations while allowing for necessary work on the infrastructure.