Which OCI capability can be used to protect against power failures within an availability domain?

The capability that protects against power failures within an availability domain is Fault Domains. Fault domains are a foundational element in Oracle Cloud Infrastructure that enhance availability and resilience by providing necessary isolation to workloads. They allow customers to distribute their resources in such a way that, in the event of a power failure or other issues affecting one fault domain, the workloads in other fault domains remain unaffected.

Fault domains partition the physical infrastructure within an availability domain, ensuring that incidents such as power disruptions, hardware failures, or other localized events do not impact all resources simultaneously. This capability is essential for applications requiring high availability, as it provides a means to architect solutions that are resilient to hardware and power-related issues.

The other options do not serve the same purpose in terms of protecting against power failures. Data Plane refers to the underlying network framework and does not provide isolation for failures. A Top of Rack Switch is a networking component that connects servers to the data center network but does not offer isolation against power failures. Service Cells are part of Oracle’s architecture for its database services but are not directly related to mitigating power failures within an availability domain.