- A
Audit
Why wrong: The Audit effect logs a compliance event for non-compliant resources but does not perform any automatic action to add the missing tag. It only reports the non-compliance.
- B
Deny
Why wrong: The Deny effect blocks the creation or update of resources that do not meet the policy condition. The team does not want to block creation; they want the tag added automatically.
- C
Append
Why wrong: The Append effect can add missing fields (like tags) during resource creation or update. However, it does not automatically apply to existing resources unless a manual remediation task is triggered. The scenario requires automatic application to existing resources without manual steps, making Modify a better fit.
- D
Modify
The Modify effect uses a defined role (via managed identity) to change resource properties on existing and new resources. It can automatically add the 'CostCenter' tag with a default value to both existing VMs (through remediation tasks that run automatically or on a schedule) and new VMs, fulfilling the requirement without blocking resource creation.
AZ-900 Describe Azure management and governance Practice Question
This AZ-900 practice question tests your understanding of describe azure management and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 an Azure subscription with hundreds of existing virtual machines. The governance team wants to enforce a policy that every virtual machine must have a tag named 'CostCenter' with a valid value. The team wants to automatically add the 'CostCenter' tag with a default value of 'Undefined' to any existing or new virtual machine that is missing the tag. They do not want to block the creation of virtual machines that are missing the tag, but they do want the tag to be added automatically within a few minutes of detection. Which Azure Policy effect should the team use?
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 existing and new resources without blocking creation. Unlike Append, which only works during resource creation and cannot modify existing resources, Modify uses a 'remediation' task to fix non-compliant resources after they are created, aligning with the requirement to add the tag within minutes of detection.
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.
- ✗
Audit
Why it's wrong here
The Audit effect logs a compliance event for non-compliant resources but does not perform any automatic action to add the missing tag. It only reports the non-compliance.
- ✗
Deny
Why it's wrong here
The Deny effect blocks the creation or update of resources that do not meet the policy condition. The team does not want to block creation; they want the tag added automatically.
- ✗
Append
Why it's wrong here
The Append effect can add missing fields (like tags) during resource creation or update. However, it does not automatically apply to existing resources unless a manual remediation task is triggered. The scenario requires automatic application to existing resources without manual steps, making Modify a better fit.
- ✓
Modify
Why this is correct
The Modify effect uses a defined role (via managed identity) to change resource properties on existing and new resources. It can automatically add the 'CostCenter' tag with a default value to both existing VMs (through remediation tasks that run automatically or on a schedule) and new VMs, fulfilling the requirement without blocking resource creation.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Append with Modify, assuming Append can handle existing resources, but Append only applies during resource creation, while Modify is designed for both new and existing resources with remediation.
Trap categories for this question
Scenario analysis trap
The Append effect can add missing fields (like tags) during resource creation or update. However, it does not automatically apply to existing resources unless a manual remediation task is triggered. The scenario requires automatic application to existing resources without manual steps, making Modify a better fit.
Detailed technical explanation
How to think about this question
The Modify effect in Azure Policy works with a 'remediation task' that runs on a schedule or on-demand to correct non-compliant resources. It uses a 'policy definition' with a 'modify' effect that specifies the tag name and value, and a managed identity is required to apply the changes. This is distinct from Append, which only adds to an array or list during creation, not for existing resources.
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 existing and new resources without blocking creation. Unlike Append, which only works during resource creation and cannot modify existing resources, Modify uses a 'remediation' task to fix non-compliant resources after they are created, aligning with the requirement to add the tag within minutes of detection.
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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