Quick Answer
The answer is the modify effect. This is the correct choice because it allows Azure Policy to add, update, or remove tags on resources and resource groups during creation or update events, making it ideal for inheriting tags from a subscription. When paired with a deployIfNotExists policy targeting resource groups, the modify effect can automatically apply the subscription’s ‘CostCenter’ tag to any new resource group at creation time, ensuring seamless inheritance without manual intervention. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this scenario tests your understanding of policy effects for tag governance, often appearing as a trap where candidates mistakenly choose ‘append’—but append cannot alter existing tags, while modify can. Remember the mnemonic: “Modify Makes Tags Match the Master” to recall that modify is the only effect that can both add and update tags dynamically.
This AZ-305 practice question tests your understanding of design identity, governance, and monitoring solutions. 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.
Your company uses Azure Policy to enforce tagging standards. You need to ensure that any new resource group automatically inherits the 'CostCenter' tag from its subscription. Which Azure Policy effect should you use?
modify
Modify effect can add or update tags, including inheriting from subscription.
deny
Why wrong: Deny blocks creation if tag missing, but doesn't inherit.
audit
Why wrong: Audit only logs non-compliance, doesn't enforce.
append
Why wrong: Append can add a static tag, but cannot inherit a dynamic value from the subscription.
Answer choices
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 enables Azure Policy to add, update, or remove tags on resources and resource groups during creation or update. When combined with a 'deployIfNotExists' policy that targets resource groups, the 'modify' effect can automatically apply the 'CostCenter' tag from the subscription to any new resource group at creation time, ensuring inheritance without 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.
modify
Why this is correct
Modify effect can add or update tags, including inheriting from subscription.
Related concept
Read the scenario before looking for a memorised answer.
deny
Why it's wrong here
Deny blocks creation if tag missing, but doesn't inherit.
audit
Why it's wrong here
Audit only logs non-compliance, doesn't enforce.
append
Why it's wrong here
Append can add a static tag, but cannot inherit a dynamic value from the subscription.
Common exam traps
The trap here is that candidates often confuse 'append' with 'modify', assuming 'append' can dynamically inherit tags, but 'append' only adds static values and cannot reference the subscription's tag or trigger remediation tasks.
Detailed technical explanation
The 'modify' effect works by defining a 'policyRule' with a 'then' section that specifies 'effect: modify' and 'details' containing 'roleDefinitionIds' and 'operations' to add or replace tags. Under the hood, Azure Policy uses a managed identity to execute a remediation task that runs a 'deployIfNotExists' deployment, which can read the subscription's 'CostCenter' tag and apply it to the resource group. This is distinct from 'append', which only adds static values and cannot dynamically reference the subscription's tag value.
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
Design identity, governance, and monitoring solutions — This question tests Design identity, governance, and monitoring solutions — Read the scenario before looking for a memorised answer..
The correct answer is: modify — The 'modify' effect is correct because it enables Azure Policy to add, update, or remove tags on resources and resource groups during creation or update. When combined with a 'deployIfNotExists' policy that targets resource groups, the 'modify' effect can automatically apply the 'CostCenter' tag from the subscription to any new resource group at creation time, ensuring inheritance without 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 24, 2026
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