Which of the following does NOT promote fault tolerance in OCI?

The option that does not promote fault tolerance in OCI is the design that involves a single point of failure. Fault tolerance is the capability of a system to continue functioning correctly even in the event of a failure of one or more components.

When a single point of failure is involved, it means that the failure of that one component could lead to the complete failure of the system or application. This design inherently lacks redundancy and does not provide any alternate pathways or backups to maintain operational continuity in case of a failure.

In contrast, using multiple fault domains and deploying applications across multiple availability domains enhances fault tolerance by distributing resources and workloads. This means that if one domain or fault domain experiences issues, others can take over, minimizing downtime. Regularly backing up data also contributes to fault tolerance by ensuring that data can be recovered in case of accidental loss or corruption, but it does not inherently prevent system failure in real-time like the other two options. Thus, the integration of strategies that avoid single points of failure is essential for establishing a resilient and fault-tolerant cloud infrastructure.