CISSP Question #1280: Real Exam Question with Answer & Explanation

Question

When designing a business continuity plan (BCP), what is the formula to determine the Maximum Tolerable Downtime (MTD)?

Options

• AAnnual Loss Expectancy (ALE) + Work Recovery Time (WRT)
• BBusiness impact analysis (BIA) + Recovery Point Objective (RPO)
• CRecovery Time Objective (RTO) + Work Recovery Time (WRT)
• DEstimated Maximum Loss (EML) + Recovery Time Objective (RTO)

Explanation

The Maximum Tolerable Downtime (MTD) is the maximum amount of time that a business process can be disrupted without causing unacceptable consequences. The MTD can be calculated by adding the Recovery Time Objective (RTO) and the Work Recovery Time (WRT). The RTO is the maximum amount of time that is allowed to restore the critical systems and resume the business operations after a disaster. The WRT is the amount of time that is needed to catch up on the backlog of work that was accumulated during the downtime. The Annual Loss Expectancy (ALE) is the expected annual loss due to a risk, calculated by multiplying the Single Loss Expectancy (SLE) and the Annualized Rate of Occurrence (ARO). The Business Impact Analysis (BIA) is a process that identifies and evaluates the critical business functions and their dependencies, and determines the impact of a disruption on them. The Recovery Point Objective (RPO) is the maximum amount of data that can be lost or corrupted without causing unacceptable consequences. The Estimated Maximum Loss (EML) is the worst-case scenario loss due to a risk, calculated by multiplying the Exposure Factor (EF) and the Asset Value (AV).

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