- A
Append
Why wrong: Incorrect. The Append effect can add additional fields to a resource during creation or update, and it can be used for tags. However, it does not support modifying existing tags or running remediation on existing resources. The Modify effect is the recommended and more capable choice for tags.
- B
Modify
Correct. The Modify effect is designed to add, change, or remove tags and other properties on resources. It can be applied during resource creation or update and supports remediation tasks to bring existing non-compliant resources into compliance. This makes it the best fit for the scenario.
- C
DeployIfNotExists
Why wrong: Incorrect. The DeployIfNotExists effect is used to deploy a resource (such as a diagnostic setting or a network security group) when a parent resource does not have it. It does not modify properties of existing resources like tags.
- D
Audit
Why wrong: Incorrect. The Audit effect creates a compliance report but does not make any changes to resources. The scenario requires automatic application of the tag, not just reporting non-compliance.
Quick Answer
The answer is the Modify effect. This is the correct choice because Modify can automatically add or change tags on Azure resources during creation or update, enforcing compliance in real-time without requiring a separate remediation task. Unlike the Append effect, which only adds properties during creation and cannot alter existing values, Modify supports both creation-time enforcement and later remediation of existing non-compliant resources, making it the only effect that directly alters resource properties while offering built-in remediation. On the Microsoft Azure Fundamentals AZ-900 exam, this distinction tests your understanding of how Azure Policy effects differ in their operational scope—a common trap is confusing Append’s creation-only behavior with Modify’s broader ability to both add and change tags, including on existing resources. Remember the memory tip: “Append adds once, Modify mends all”—if you need to fix existing resources later, choose Modify.
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 has a policy that all Azure resources must have a tag named 'CostCenter'. The governance team wants to automatically add the tag with a default value 'IT' to any new resource that is created without it. The team wants the tag to be applied during resource creation, not just report non-compliance. The solution must also support remediation for existing non-compliant resources if needed later. Which Azure Policy effect should the team use in their policy definition?
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
Modify
The Modify effect is correct because it can automatically add or change tags on resources during creation or update, enforcing compliance in real-time. Unlike Append, Modify supports both creation and remediation of existing resources, and unlike DeployIfNotExists, it directly alters the resource properties without deploying a separate remediation task.
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.
- ✗
Append
Why it's wrong here
Incorrect. The Append effect can add additional fields to a resource during creation or update, and it can be used for tags. However, it does not support modifying existing tags or running remediation on existing resources. The Modify effect is the recommended and more capable choice for tags.
- ✓
Modify
Why this is correct
Correct. The Modify effect is designed to add, change, or remove tags and other properties on resources. It can be applied during resource creation or update and supports remediation tasks to bring existing non-compliant resources into compliance. This makes it the best fit for the scenario.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
DeployIfNotExists
Why it's wrong here
Incorrect. The DeployIfNotExists effect is used to deploy a resource (such as a diagnostic setting or a network security group) when a parent resource does not have it. It does not modify properties of existing resources like tags.
- ✗
Audit
Why it's wrong here
Incorrect. The Audit effect creates a compliance report but does not make any changes to resources. The scenario requires automatic application of the tag, not just reporting non-compliance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Append with Modify, thinking Append can also update existing tags, but Append only adds to properties that don't exist, while Modify can replace or add tags and supports full remediation for existing resources.
Trap categories for this question
Scenario analysis trap
Incorrect. The Audit effect creates a compliance report but does not make any changes to resources. The scenario requires automatic application of the tag, not just reporting non-compliance.
Detailed technical explanation
How to think about this question
The Modify effect uses a 'modify' operation in the policy definition to add, update, or remove tags on resources during create or update operations, leveraging Azure Resource Manager's built-in tag API. It supports 'remediation' via a managed identity that can scan and fix existing non-compliant resources on-demand, making it ideal for both proactive and reactive tag enforcement. In contrast, Append only adds to arrays or strings and cannot overwrite existing values, which is a key limitation for tag management.
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: Modify — The Modify effect is correct because it can automatically add or change tags on resources during creation or update, enforcing compliance in real-time. Unlike Append, Modify supports both creation and remediation of existing resources, and unlike DeployIfNotExists, it directly alters the resource properties without deploying a separate remediation task.
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
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.
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