Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has a production Azure subscription used by multiple teams. The governance team wants to enforce a rule that only virtual machines (VMs) of specific SKU sizes (e.g., Standard_D2s_v3 and Standard_D4s_v3) can be deployed. If a team attempts to deploy a VM of a different SKU size, the deployment must be blocked immediately and the user must see an error message explaining the restriction. Which Azure feature should the governance team use?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Azure Role-Based Access Control (RBAC) with a custom role that denies the 'Microsoft.Compute/virtualMachines/write' action
This is incorrect because Azure RBAC controls who can perform actions on resources (authorization), but it does not evaluate the configuration or properties of the resource being created. A Deny assignment for the write action would block all VM creations, not just those with disallowed SKU sizes. RBAC is not designed for policy enforcement based on resource properties.
B
Best answer
Azure Policy with the 'Deny' effect
Azure Policy with the 'Deny' effect is the correct solution. A policy definition can specify allowed VM SKU sizes using conditions. When assigned to a scope (e.g., subscription or resource group), any deployment of a VM that does not comply with the condition is blocked before the resource is created. This is the appropriate service for enforcing rules on resource configuration.
C
Distractor review
Azure Blueprints with a resource lock
Azure Blueprints is used to deploy a set of repeatable and governed environments, including policies, role assignments, and resource groups. However, a resource lock only prevents deletion or modification of existing resources; it does not block the creation of new resources with disallowed properties. Additionally, Blueprints alone cannot enforce a deny on SKU sizes without an accompanying Azure Policy.
D
Distractor review
Azure resource locks at the resource group level
Resource locks are used to prevent accidental deletion or modification of critical resources. A 'CanNotDelete' or 'ReadOnly' lock on a resource group would block all deletions or modifications, but it does not evaluate the properties of new resources being deployed. It cannot prevent the creation of a VM with a disallowed SKU size.
Common exam trap
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Technical deep dive
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer is building a serverless application that requires integration with an on-premises SQL Server database for real-time data processing. The on-premises network is connected to Azure via a site-to-site VPN. Which Azure service would allow the function to securely access the on-premises database without exposing it to the public internet?
Question 2
A solutions architect is designing a storage solution for a large media company. The company needs to store video files that are accessed infrequently but must be retained for several years for compliance. Which two Azure storage options meet these requirements? (Select two.)
Question 3
A company deploys a multi-tier application using Azure virtual machines. The web tier VMs must be evenly distributed across two distinct data centers within an Azure region to avoid a single point of failure from an infrastructure outage. Which Azure construct should they use to meet this requirement?
Question 4
A company wants to enforce a set of security policies across all their Azure subscriptions. They have created several individual policy definitions. Which Azure construct should they use to group these policies together and assign them as a single package?
Question 5
A company deploys a line-of-business application on an Azure virtual machine. The IT team wants to ensure the application remains secure. According to the shared responsibility model, which of the following security tasks is the sole responsibility of the customer (the company)?
Question 6
A company develops a web API that runs on Azure App Service. The development team wants to deploy a new version of the API to a staging environment, run integration tests against it, and then gradually shift production traffic to the new version. If any issues are detected, they want to immediately roll back to the previous version without redeploying. Which Azure App Service feature should the team use to meet these requirements?
FAQ
Questions learners often ask
What does this AZ-900 question test?
Standard ACLs match source addresses.
What is the correct answer to this question?
The correct answer is: Azure Policy with the 'Deny' effect — Azure Policy with the 'Deny' effect is the correct feature to block the deployment of resources that do not comply with a defined rule. In this scenario, a policy definition can specify the allowed VM SKUs, and when assigned to the subscription with the 'Deny' effect, any attempt to create a VM with a disallowed SKU will fail at deployment time. The user will receive a clear error message. Azure Policy is designed for enforcing organizational standards and assessing compliance at scale.
What should I do if I get this AZ-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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