Quick Answer
The answer is enforceRegoPolicy. This Azure Policy effect is the correct choice because it leverages Open Policy Agent (OPA) Gatekeeper to enforce approved container images in AKS at admission time, blocking any pod that attempts to use an image from outside your private Azure Container Registry. Unlike audit, which only logs violations, or deny, which is not directly supported for AKS admission control, enforceRegoPolicy actively intercepts and rejects non-compliant deployments before they reach the cluster. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of how Azure Policy integrates with OPA Gatekeeper for Kubernetes security, often appearing as a scenario where you must distinguish between effects that merely report versus those that enforce. A common trap is selecting deny, but remember that AKS uses the Rego policy language for admission enforcement, not standard Azure RBAC deny effects. Memory tip: think “Rego Rejects” — enforceRegoPolicy is the only effect that truly blocks at admission time.
This SC-100 practice question tests your understanding of design security solutions for infrastructure. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You need to secure Azure Kubernetes Service (AKS) clusters by ensuring that only approved container images from a private Azure Container Registry (ACR) can be deployed. The solution should enforce this at admission time. Which Azure Policy effect should you use?
modify
Why wrong: Modify changes resources but does not enforce image source restrictions.
enforceRegoPolicy
This effect uses OPA Gatekeeper to enforce custom admission policies, such as restricting container image sources.
audit
Why wrong: Audit only logs non-compliant resources, does not block deployment.
deny
Why wrong: Deny is not supported for AKS admission control; the correct effect is enforceRegoPolicy.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
enforceRegoPolicy
The 'enforceRegoPolicy' effect for Azure Policy on AKS uses Open Policy Agent (OPA) Gatekeeper to enforce that only images from specific registries are allowed. 'audit' only logs, 'deny' is not directly applicable for AKS admission, 'modify' changes resources but does not block.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
modify
Why it's wrong here
Modify changes resources but does not enforce image source restrictions.
enforceRegoPolicy
Why this is correct
This effect uses OPA Gatekeeper to enforce custom admission policies, such as restricting container image sources.
Related concept
Standard ACLs match source addresses.
audit
Why it's wrong here
Audit only logs non-compliant resources, does not block deployment.
deny
Why it's wrong here
Deny is not supported for AKS admission control; the correct effect is enforceRegoPolicy.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SC-100 ACL questions on filtering logic and placement.
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FAQ
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Standard ACLs match source addresses..
The correct answer is: enforceRegoPolicy — The 'enforceRegoPolicy' effect for Azure Policy on AKS uses Open Policy Agent (OPA) Gatekeeper to enforce that only images from specific registries are allowed. 'audit' only logs, 'deny' is not directly applicable for AKS admission, 'modify' changes resources but does not block.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SC-100 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Same concept, more angles
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Variation 1. Your company is deploying Azure Kubernetes Service (AKS) and needs to secure container workloads. You must ensure that only approved container images from a trusted Azure Container Registry (ACR) can be deployed. What should you implement?
easyWhy B: Option C is correct because Azure Policy with the 'Only allow approved container images' built-in initiative enforces that containers in AKS must originate from a specified ACR. Option A is incorrect because network policies control traffic, not image source. Option B is incorrect because Azure AD integration controls authentication, not image source. Option D is incorrect because Azure Key Vault stores secrets, not image approval.
Last reviewed: Jun 21, 2026
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