Mean Time to Repair (MTTR) measures?

• A. The mean time to repair a network device when it breaks.
• B. The average time to restore service after a power outage.
• C. The time to detect a security incident.
• D. The time between installing a patch and its deployment

Answer: (A)

Mean Time to Repair measures the average time required to repair a failed component and bring it back into service. In a network context, this means the time from when a device stops functioning to when it is repaired and traffic can flow again. It encompasses the work to diagnose the fault, perform the repair or replacement, and verify that the device is operating correctly. This metric focuses on restoring functionality quickly after a failure, which is why it fits the idea of repairing a broken network device. It’s different from how long it takes to detect an incident (that’s mean time to detect), from how long a patch takes to deploy (patch deployment time), or from the total downtime after a power outage, which is a broader outage-duration measure.