SY0-501 Question #354: Real Exam Question with Answer & Explanation

Question

A security analyst is updating a BIA document. The security analyst notices the support vendor's time to replace a server hard drive went from eight hours to two hours. Given these new metrics, which of the following can be concluded? (Select TWO)

Options

• AThe MTTR is faster.
• BThe MTTR is slower.
• CThe RTO has increased.
• DThe RTO has decreased.
• EThe MTTF has increased.
• FThe MTTF has decreased.

Explanation

A reduced hard drive replacement time from 8 to 2 hours directly impacts recovery metrics in a Business Impact Analysis (BIA). Faster repair times improve both MTTR and the ability to meet RTO targets.

Common mistakes.

• B. MTTR being slower is incorrect because the repair time was reduced from 8 hours to 2 hours, which by definition makes MTTR faster, not slower.
• C. RTO increasing is incorrect because a shorter replacement time reduces the time needed to recover, which decreases (not increases) the effective RTO.
• E. MTTF (Mean Time To Failure) measures the average time a component operates before failing, which is a reliability metric unrelated to repair or replacement speed and is not affected by vendor service time changes.
• F. MTTF decreasing is also incorrect because the vendor's repair time has no bearing on how long a hard drive operates before it fails; MTTF is determined by hardware reliability, not servicing speed.

Concept tested. BIA metrics: MTTR, RTO, and MTTF distinctions

Reference. https://learn.microsoft.com/en-us/azure/reliability/disaster-recovery-overview

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