CRISC IT Risk Assessment Practice Question
In the FAIR framework, what does Loss Event Frequency (LEF) represent?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The expected number of loss events per year
LEF is the product of Threat Event Frequency (TEF) and Vulnerability (V), representing how often a loss event is expected to occur.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The number of threat events per year
Why it's wrong here
LEF is the probable frequency of threat events that become losses, not the raw count of all threat events per year. It is tempting because threat event frequency is the input from which LEF is derived, so the two are closely related in the FAIR taxonomy.
- ✓
The expected number of loss events per year
Why this is correct
Loss Event Frequency quantifies how often threat events are expected to result in loss, expressed as a rate per unit time. In FAIR it is derived from threat event frequency and vulnerability, and is multiplied by loss magnitude to yield risk.
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The probability that a threat event will result in a loss
Why it's wrong here
The probability that a threat event results in loss is Vulnerability, which sits between Threat Event Frequency and LEF in the FAIR model. It is tempting because vulnerability directly modulates how often threat events convert into actual loss events.
- ✗
The total financial loss per event
Why it's wrong here
Financial loss per event is the Loss Magnitude, not LEF; LEF quantifies how often loss events occur, not their cost. It is tempting because LEF and Loss Magnitude are the two factors multiplied to derive risk, so both feed the same calculation.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CRISC practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CRISC exam.