An auditor is assessing the 'Availability' criteria for a cloud service provider. The provider claims 99.9% uptime. Which of the following metrics would be MOST useful to verify this claim?

Answer options:

Mean Time to Repair (MTTR)

Mean Time Between Failures (MTBF)

Total downtime minutes per year

Number of help desk tickets

How to approach this question

Availability is a calculation of (Total Time - Downtime) / Total Time. You need the downtime.

Full Answer

C.Total downtime minutes per year✓ Correct

Availability is calculated as: (Total Time - Downtime) / Total Time. Knowing the total downtime minutes allows the auditor to mathematically verify the 99.9% uptime assertion.

Common mistakes

Focusing on MTBF or MTTR alone (which are components of availability but not the direct measure of uptime percentage).

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