Quick Answer
The answer is the Custom Script Extension (CSE), which is the correct choice because it allows you to run a PowerShell script inside a newly deployed Azure virtual machine to configure application settings immediately after deployment. CSE works by leveraging the Azure VM agent to download and execute your script on the VM, making it ideal for post-deployment configuration tasks like installing software or adjusting registry keys. On the AZ-104 exam, this scenario tests your understanding of VM extensions and the distinction between CSE and other tools like Desired State Configuration (DSC) or Run Command—a common trap is confusing CSE with DSC, but remember that CSE runs a one-time script, whereas DSC manages ongoing state. For a quick memory tip, think of CSE as the “setup helper” that runs your script right after the VM boots, perfect for that initial application configuration.
This AZ-104 practice question tests your understanding of deploy and manage azure compute. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
You need to run a PowerShell script inside a newly deployed Azure virtual machine to configure application settings immediately after deployment. Which feature should you use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Azure Policy
Why wrong: Azure Policy enforces governance rules but does not run guest OS scripts.
A Custom Script Extension
A Custom Script Extension runs scripts inside the virtual machine.
Boot diagnostics
Why wrong: Boot diagnostics is used for troubleshooting and does not execute scripts.
An availability set
Why wrong: An availability set provides resiliency and does not configure the guest OS.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A Custom Script Extension
The Custom Script Extension (CSE) is the correct choice because it allows you to run a PowerShell script on an Azure VM after deployment, making it ideal for configuring application settings. CSE downloads and executes scripts on the VM using the Azure VM agent, and it can be invoked during VM creation or post-deployment via ARM templates, Azure CLI, or PowerShell.
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.
Azure Policy
Why it's wrong here
Azure Policy enforces governance rules but does not run guest OS scripts.
A Custom Script Extension
Why this is correct
A Custom Script Extension runs scripts inside the virtual machine.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Boot diagnostics
Why it's wrong here
Boot diagnostics is used for troubleshooting and does not execute scripts.
An availability set
Why it's wrong here
An availability set provides resiliency and does not configure the guest OS.
Common exam traps
The trap here is that candidates confuse Azure Policy (which governs resource configuration at the Azure control plane) with the Custom Script Extension (which operates inside the guest OS), leading them to incorrectly select Azure Policy for post-deployment script execution.
Detailed technical explanation
Under the hood, the Custom Script Extension leverages the Azure VM agent (WindowsGuestAgent) to download the script from Azure Storage, GitHub, or a public URL, then executes it with local system privileges. A subtle behavior is that the extension runs only once by default; if the script fails, you must delete the extension resource and re-add it to retry. In real-world scenarios, CSE is often combined with ARM template deployments to bootstrap IIS, install SQL Server, or join a domain immediately after provisioning.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deploy and Manage Azure Compute — study guide chapter
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FAQ
Deploy and Manage Azure Compute — This question tests Deploy and Manage Azure Compute — Read the scenario before looking for a memorised answer..
The correct answer is: A Custom Script Extension — The Custom Script Extension (CSE) is the correct choice because it allows you to run a PowerShell script on an Azure VM after deployment, making it ideal for configuring application settings. CSE downloads and executes scripts on the VM using the Azure VM agent, and it can be invoked during VM creation or post-deployment via ARM templates, Azure CLI, or PowerShell.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You need to run a scheduled script on an Azure virtual machine every time the VM starts. Which feature should you use?
mediumWhy B: The Custom Script Extension (CSE) is the correct choice because it allows you to run a script on an Azure VM during startup by configuring it as part of the VM's provisioning or by using a scheduled task triggered at boot. CSE downloads and executes scripts from Azure Storage or GitHub, making it ideal for custom initialization tasks that must run every time the VM starts.
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Last reviewed: Jun 11, 2026
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