CAS-004 Governance, Risk, and Compliance Practice Question
A newly hired CISO is reviewing the organization's risk register and finds that a legacy payment application carries a high inherent risk rating, but after accounting for the web application firewall, tokenization, and quarterly penetration testing already in place, the rating drops substantially. Which risk concept explains the difference between these two ratings?
⚠ Common exam trap
The trap here is conflating residual risk with risk appetite, since both involve deciding whether an exposure is acceptable, when only residual risk measures what remains after controls are applied.
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
✓
Residual risk
The high rating represents inherent risk, the exposure before safeguards are considered. Once the firewall, tokenization, and recurring penetration tests are factored in, the remaining exposure is residual risk. Risk appetite is a tolerance threshold, inherent risk is the pre-control baseline, and control risk concerns control failure rather than the net exposure level.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Inherent risk
Why it's wrong here
Inherent risk is the exposure that exists before any controls are applied, which the scenario already identifies as the high initial rating. The question asks what explains the lower rating after controls are considered, so inherent risk describes the starting point rather than the difference being examined.
- ✓
Residual risk
Why this is correct
Residual risk is what remains after existing controls are applied to an inherent risk. The firewall, tokenization, and recurring penetration tests reduce the likelihood and impact of exploitation, so the lower rating reflects residual risk. The scenario explicitly describes inherent risk dropping once current controls are considered, which is the definition of residual risk.
- ✗
Control risk
Why it's wrong here
Control risk refers to the possibility that a control fails to prevent or detect an issue as designed, or that testing reliance on controls is misplaced. It is a component used in audit and risk modeling, not the term for the post-control exposure level itself. The scenario's reduced rating represents remaining exposure, which is classified differently.
- ✗
Risk appetite
Why it's wrong here
Risk appetite expresses how much risk leadership is willing to accept in pursuit of objectives. It is a threshold used to decide whether a given exposure is tolerable, not a measure of how much controls reduce an identified risk. The scenario describes a numerical rating changing because controls exist, which is unrelated to the organization's stated willingness to accept risk.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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