Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has an Azure subscription used by multiple development teams. The security team wants to ensure that every virtual network (VNet) created in the subscription automatically has a specific network security group (NSG) associated with its default subnet. The NSG rules are defined by the security team, and developers should not have to perform any extra steps after creating a VNet. Which Azure Policy effect should the security team use in the policy definition?
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
Deny
The Deny effect blocks creation of the VNet if it does not meet the condition. While this enforces compliance, it does not automatically deploy the NSG. Developers would have to manually create and associate the NSG before the VNet can be created, which adds extra steps.
B
Distractor review
Audit
The Audit effect logs a compliance event when the condition is not met (e.g., missing NSG association), but it does not deploy the NSG or remediate the issue. It only alerts the security team to the non-compliance, requiring manual follow-up.
C
Best answer
DeployIfNotExists
The DeployIfNotExists effect automatically deploys a resource (in this case, an NSG and its association to the subnet) when a VNet is created without it. This ensures compliance without manual effort from developers, matching the requirement exactly.
D
Distractor review
Append
The Append effect adds additional fields to the existing resource definition (e.g., tags on a VNet). However, an NSG association is a separate resource (a subnet property referencing the NSG), not a property of the VNet itself. Append cannot create or attach a separate resource like an NSG.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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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?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: DeployIfNotExists — Azure Policy supports several effects. The 'DeployIfNotExists' effect is specifically designed to automatically deploy a resource (such as an NSG) when a non-compliant resource is created. In this scenario, when a VNet is created without the required NSG association on its default subnet, DeployIfNotExists will trigger the deployment of the NSG and associate it, ensuring compliance without requiring manual intervention from the developers. Other effects are not suitable: 'Deny' would block VNet creation entirely if the NSG is not present, which is disruptive and does not deploy the NSG. 'Audit' only logs non-compliance but does not fix it. 'Append' can add properties to the resource itself, but an NSG association is a separate resource (a subnet property that references the NSG), not a property of the VNet, so Append cannot create the association.
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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