ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question
A SaaS provider is negotiating an SLA that guarantees 99.5 percent monthly service availability, with any planned maintenance performed during designated windows and therefore excluded from the calculation. If a given month has 30 days, what is the maximum total amount of unscheduled downtime the provider can incur before violating the SLA?
Service availability percentages in an SLA are typically calculated as the percentage of total time in a period that the service is fully operational, excluding any agreed-upon maintenance windows. A 30-day month contains 30 days × 24 hours = 720 hours of total time. An availability of 99.5 percent allows for 0.5 percent downtime: 0.005 × 720 hours = 3.6 hours. Converting 0.6 hours to minutes (0.6 × 60) yields 36 minutes. Therefore, the total unscheduled downtime permitted in the month is 3 hours 36 minutes. The other options mis-calculate the allowable downtime: 15 minutes and 36 minutes correspond to 99.965 percent and 99.917 percent availability respectively, while 36 hours reflects only 95 percent availability-well below the 99.5 percent target.
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)