CSSLP Question #245: Real Exam Question with Answer & Explanation

Question

Single Loss Expectancy (SLE) represents an organization's loss from a single threat. Which of the following formulas best describes the Single Loss Expectancy (SLE)?

Options

• ASLE = Asset Value (AV) * Exposure Factor (EF)
• BSLE = Annualized Loss Expectancy (ALE) * Annualized Rate of Occurrence (ARO)
• CSLE = Annualized Loss Expectancy (ALE) * Exposure Factor (EF)
• DSLE = Asset Value (AV) * Annualized Rate of Occurrence (ARO)

Explanation

Single Loss Expectancy (SLE) quantifies the financial loss expected from a single occurrence of a specific threat.

Common mistakes.

• B. This formula incorrectly combines ALE and ARO; ALE (Annualized Loss Expectancy) itself is derived from SLE and ARO.
• C. This formula incorrectly combines ALE and EF; ALE is a measure of annual loss, not a factor in single event loss calculation.
• D. This formula incorrectly combines Asset Value with ARO; ARO (Annualized Rate of Occurrence) measures how often a threat is expected to occur annually, not the loss from a single event.

Concept tested. Risk assessment calculation - Single Loss Expectancy

Reference. https://csrc.nist.gov/glossary/term/single_loss_expectancy

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