Quick Answer
The answer is the Deny effect. This is the correct choice because it actively blocks resource creation at the Azure Resource Manager level, preventing any virtual machine from being provisioned if it violates the policy conditions. When a Deny policy is assigned, any attempt to create a VM that doesn’t meet the rules is rejected with a 403 Forbidden status code, and the requester receives an error message explaining the policy violation and the need to request access. On the AZ-900 exam, this tests your understanding of how Azure Policy effects enforce governance—Deny is the strictest effect for blocking actions, while effects like Audit only log violations without stopping them. A common trap is confusing Deny with DeployIfNotExists, which modifies resources after creation rather than preventing it. Remember the memory tip: “Deny says no before it goes,” meaning the request is blocked before any resource is even started.
This AZ-900 practice question tests your understanding of describe azure management and governance. 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.
A company wants to ensure that no one can create virtual machines without approval from the IT department. They want to block all VM creation attempts and notify the requester that they need to request access. Which Azure Policy effect should they use?
Deny
Deny prevents the resource creation and can display a user-defined error message explaining the approval process.
Audit
Why wrong: Audit only logs the non-compliant attempts but does not block them.
Append
Why wrong: Append can add additional fields like tags, but it does not block creation.
Disabled
Why wrong: Disabled means the policy is not evaluated, so no enforcement occurs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Deny
The Deny effect is correct because it actively prevents the creation of virtual machines by blocking the resource creation request at the Azure Resource Manager level. When a policy with the Deny effect is assigned, any attempt to create a VM that does not meet the policy's conditions is rejected with a 403 (Forbidden) status code, and the requester receives an error message indicating the policy violation and the need to request access. This directly enforces the requirement to block all VM creation attempts without requiring manual intervention.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Deny
Why this is correct
Deny prevents the resource creation and can display a user-defined error message explaining the approval process.
Related concept
Read the scenario before looking for a memorised answer.
Audit
Why it's wrong here
Audit only logs the non-compliant attempts but does not block them.
Append
Why it's wrong here
Append can add additional fields like tags, but it does not block creation.
Disabled
Why it's wrong here
Disabled means the policy is not evaluated, so no enforcement occurs.
Common exam traps
The trap here is that candidates often confuse the Deny effect with the Audit effect, mistakenly thinking that logging violations is sufficient to block actions, but Azure Policy's Audit effect does not prevent resource creation—it only records the event for later review.
Detailed technical explanation
Under the hood, Azure Policy effects are evaluated by the Azure Resource Manager before any resource is provisioned. The Deny effect uses a pre-existing deny assignment that overrides any role-based access control (RBAC) permissions, ensuring that even users with Contributor or Owner roles cannot bypass the policy. In a real-world scenario, this is critical for enforcing governance in large enterprises where IT departments need to control cost and security by requiring approval for high-cost resources like VMs, and the policy can be combined with a custom error message to guide users to a request form.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Describe Azure management and governance — This question tests Describe Azure management and governance — Read the scenario before looking for a memorised answer..
The correct answer is: Deny — The Deny effect is correct because it actively prevents the creation of virtual machines by blocking the resource creation request at the Azure Resource Manager level. When a policy with the Deny effect is assigned, any attempt to create a VM that does not meet the policy's conditions is rejected with a 403 (Forbidden) status code, and the requester receives an error message indicating the policy violation and the need to request access. This directly enforces the requirement to block all VM creation attempts without requiring manual intervention.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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