CompTIA Security+ (SY0-701) · Free practice question 9 of 12
Mean time between failures reliability
Hardware records at Selkirk Transit show that its ticketing kiosks run an average of 4,200 hours before a fault occurs. Which metric does this figure represent?
- A.Mean time between failures (MTBF)
- B.Recovery point objective (RPO)
- C.Annualized rate of occurrence (ARO)
- D.Mean time to repair (MTTR)
Show answer and explanation
Correct answer: A. Mean time between failures (MTBF)
Why: MTBF measures the average operating time between failures and indicates how reliable a component is. MTTR measures the average time to restore a failed component. ARO estimates how often a risk event occurs per year, and RPO is a target for acceptable data loss, so neither measures hardware reliability.
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