An Azure application uses the services shown in the table. How do you calculate the application's composite SLA?
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Correct answer: 0.999 * 0.9999 = 0.9989001 = 99.89001%.
Why this is the answer
When calculating the composite SLA for an application where multiple services are used in series (meaning all services must be available for the application to function), you multiply the individual SLAs together. This is because the overall availability is dependent on the availability of each component. In this case, 0.999 0.9999 = 0.9989001. Dividing (0.999 / 0.9999) or taking the maximum (Max) or minimum (Min) of the individual SLAs would be incorrect for a series dependency. Division is not a standard method for composite SLA calculation. Max is used for parallel dependencies (where only one service needs to be available), and Min would incorrectly represent the overall availability as simply the worst-performing component, ignoring the combined risk.
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