- A
Deny
Why wrong: The Deny effect prevents the creation or update of resources that do not match the policy condition. This would block resource creation if tags are missing, which is not the desired behavior because the company wants to allow creation and automatically add missing tags.
- B
Audit
Why wrong: The Audit effect creates a log entry when a resource is non-compliant but does not take any action to modify the resource. It would not add the missing tags, so it does not meet the requirement to automatically add default tags.
- C
Append
The Append effect is designed to add additional fields (such as tags) to a resource during creation or update. It does not block the creation; instead, it automatically applies the specified values to bring the resource into compliance. This perfectly matches the requirement to add default tags without blocking resource creation.
- D
DeployIfNotExists
Why wrong: The DeployIfNotExists effect is used to deploy a resource (like a network security group or diagnostic setting) if the required resource does not exist. It is not suitable for adding tags to the current resource; its purpose is to provision a separate resource during evaluation.
Quick Answer
The answer is the Append effect. This is correct because Append works by adding specified fields—such as tags—to a resource request during creation or update without rejecting the request, making it ideal for automatically inserting missing 'Owner' and 'CostCenter' tags with default values of 'Unassigned' while still allowing the resource to be deployed. On the AZ-900 exam, this scenario tests your understanding of how Azure Policy effects differ: Append modifies the request, whereas Deny blocks it, and Modify can alter existing resources but is not needed here. A common trap is confusing Append with Deny, but remember that Append adds missing values without blocking creation. For a quick memory tip, think "Append adds, Deny defends"—Append simply appends what’s missing to keep governance compliant without interruption.
AZ-900 Describe Azure management and governance Practice Question
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 uses Azure Policy to enforce governance on their subscriptions. They want to ensure that every newly created Azure resource automatically receives two tags: 'Owner' and 'CostCenter'. If a user or an automated process creates a resource without specifying these tags, the policy should add the missing tags with default values of 'Unassigned' without blocking the resource creation. Which Azure Policy effect should be used in the policy definitions?
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
Append
Option C (Append) is correct because the Append effect adds specified fields (such as tags) to a resource during creation or update without blocking the operation. In this scenario, the policy must automatically add the 'Owner' and 'CostCenter' tags with default values of 'Unassigned' when they are missing, which is exactly what Append does—it modifies the resource request to include the missing tags before the resource is created.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deny
Why it's wrong here
The Deny effect prevents the creation or update of resources that do not match the policy condition. This would block resource creation if tags are missing, which is not the desired behavior because the company wants to allow creation and automatically add missing tags.
- ✗
Audit
Why it's wrong here
The Audit effect creates a log entry when a resource is non-compliant but does not take any action to modify the resource. It would not add the missing tags, so it does not meet the requirement to automatically add default tags.
- ✓
Append
Why this is correct
The Append effect is designed to add additional fields (such as tags) to a resource during creation or update. It does not block the creation; instead, it automatically applies the specified values to bring the resource into compliance. This perfectly matches the requirement to add default tags without blocking resource creation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
DeployIfNotExists
Why it's wrong here
The DeployIfNotExists effect is used to deploy a resource (like a network security group or diagnostic setting) if the required resource does not exist. It is not suitable for adding tags to the current resource; its purpose is to provision a separate resource during evaluation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Append with DeployIfNotExists: candidates often choose DeployIfNotExists because it sounds like it 'deploys' missing tags, but DeployIfNotExists is designed to deploy a separate resource (like a diagnostic setting) after the fact, not to modify the resource being created, whereas Append directly alters the resource request in-flight.
Detailed technical explanation
How to think about this question
The Append effect works by injecting additional properties into the resource's PUT or PATCH request during deployment, effectively modifying the resource definition before it reaches the Resource Manager. This is implemented via a policy rule that evaluates the resource properties and, if the condition (e.g., missing tag) is true, adds the specified value. A subtle behavior is that Append only applies during resource creation or update operations, and it cannot modify existing resources unless they are updated; for existing resources, a remediation task using DeployIfNotExists would be needed.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe Azure management and governance — This question tests Describe Azure management and governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Append — Option C (Append) is correct because the Append effect adds specified fields (such as tags) to a resource during creation or update without blocking the operation. In this scenario, the policy must automatically add the 'Owner' and 'CostCenter' tags with default values of 'Unassigned' when they are missing, which is exactly what Append does—it modifies the resource request to include the missing tags before the resource is created.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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