What term identifies any single software or hardware flaw that can bring down a system if it fails?

• A. High Availability
• B. Replication
• C. Redundancy
• D. Single Point of Failure (SPOF)

Answer: (D)

A single point of failure is a flaw in design where one component’s failure can bring down the entire system. When there’s no alternative path, backup, or load-sharing option for that critical part, the system hinges on that single element. If it fails, service stops because there’s no other way to keep operations running.

This term is the best fit because it identifies the exact vulnerability—the one component whose failure cascades to a full outage. In contrast, high availability is about strategies to keep systems up despite failures (often by removing SPOFs and adding failover paths). Replication involves making copies of data or services to preserve availability and integrity, not naming the vulnerability itself. Redundancy refers to having spare components or paths to prevent downtime, which are measures to counter SPOFs but do not name the flaw itself.