Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has a critical resource group named 'Prod-Databases' that contains Azure SQL databases and virtual machines used by a production order-processing system. The database administrator wants to prevent any user, including administrators, from accidentally deleting or modifying resources in this resource group. The operations team needs a safeguard that requires an explicit action to be taken before any changes become possible, without affecting the ability to manage resources in other resource groups. Which Azure feature should the team implement?
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 Policy with the Deny effect
Azure Policy with a Deny effect can prevent creation of non-compliant resources and block modifications that violate a policy rule, but it does not directly protect against deletion of existing resources by users with Owner or Contributor roles. Resource Locks are specifically designed for this purpose.
B
Distractor review
Azure RBAC role assignment (e.g., restrict to Reader role)
RBAC roles control who can perform actions, but a user with the Owner role can delete any resource. Changing roles for all users is not practical and does not prevent an Owner from removing the role assignment. Resource Locks are additive and require a lock removal step.
C
Best answer
Azure Resource Lock (CanNotDelete)
Resource Locks (CanNotDelete or ReadOnly) prevent accidental deletion or modification of critical Azure resources. A user must first remove the lock, which provides a clear safeguard. This is the correct feature for the described scenario.
D
Distractor review
Azure management group
Management groups are used to organize subscriptions and apply governance at scale (e.g., policies, RBAC). They do not provide protection at the resource group level. Applying a management group is not a direct safeguard for a single resource group.
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 Resource Lock (CanNotDelete) — Azure Resource Locks are designed to prevent accidental deletion or modification of critical resources. A lock (CanNotDelete or ReadOnly) can be applied at a subscription, resource group, or individual resource level. To delete or modify a locked resource, a user must first remove the lock, which provides an additional layer of protection. RBAC does not block actions by users with sufficient permissions (e.g., Owner), and Azure Policy Deny effects typically apply during resource creation or update, not to all delete operations. Management groups are used for organizing subscriptions, not for protecting individual resource groups.
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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