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 has a policy that all Azure resources must have a 'CostCenter' tag. They want to automatically audit and deny the creation of any resource that does not include this tag. Which Azure Policy effect should they use?
Deny
Correct. Deny prevents the creation of resources that do not comply with the policy.
Audit
Why wrong: Audit creates a log entry for non-compliant resources but does not block creation.
Append
Why wrong: Append adds missing tags during creation but does not deny the creation; the resource is still created.
DeployIfNotExists
Why wrong: DeployIfNotExists deploys resources to fix non-compliance, but it does not block or deny creation.
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 the company's policy requires that any resource creation attempt missing the 'CostCenter' tag must be blocked entirely, not just reported or modified. Azure Policy's Deny effect actively prevents the resource from being provisioned by rejecting the API call at the Azure Resource Manager level, ensuring non-compliant resources are never created.
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
Correct. Deny prevents the creation of resources that do not comply with the policy.
Related concept
Read the scenario before looking for a memorised answer.
Audit
Why it's wrong here
Audit creates a log entry for non-compliant resources but does not block creation.
Append
Why it's wrong here
Append adds missing tags during creation but does not deny the creation; the resource is still created.
DeployIfNotExists
Why it's wrong here
DeployIfNotExists deploys resources to fix non-compliance, but it does not block or deny creation.
Common exam traps
The trap here is that candidates often confuse 'Audit' (which only reports) with 'Deny' (which blocks), or mistakenly think 'Append' can enforce a mandatory tag by adding it, but Append does not prevent creation of resources that already lack the tag—it only modifies them after the fact, which violates the 'deny' requirement.
Detailed technical explanation
Azure Policy effects are evaluated during the PUT/PATCH request to the Azure Resource Manager (ARM) before the resource is persisted. The Deny effect returns an HTTP 403 Forbidden status with a policy violation message, preventing any downstream resource provider operations. In contrast, Append uses a 'details' field with a template to inject tags or values, but it cannot enforce a mandatory tag requirement because it only adds values if the tag is missing, not block the resource.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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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 the company's policy requires that any resource creation attempt missing the 'CostCenter' tag must be blocked entirely, not just reported or modified. Azure Policy's Deny effect actively prevents the resource from being provisioned by rejecting the API call at the Azure Resource Manager level, ensuring non-compliant resources are never created.
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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