The answer is the Custom Script Extension (CSE), which you should add to your ARM template for first-boot configuration. This Azure feature is correct because it executes PowerShell or Bash scripts immediately after the VM provisions, allowing you to install IIS, copy application files from storage via the `fileUris` property, and run a bootstrap script—all without manual login. On the AZ-104 exam, this tests your understanding of VM extensions as post-deployment automation tools, often appearing in scenarios where you must configure a VM during its initial boot cycle. A common trap is confusing CSE with Desired State Configuration (DSC); remember that CSE runs arbitrary scripts once, while DSC manages ongoing state. For memory, think “CSE = Custom Script on First Boot” to distinguish it from other extensions.
AZ-104 Deploy and Manage Azure Compute Practice Question
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 deploy a Windows VM with an ARM template. During the first boot, it must install IIS, copy application files from storage, and run a bootstrap script. Which Azure feature should you add to the deployment?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A VM extension such as Custom Script Extension
The Custom Script Extension (CSE) is the correct Azure feature to use because it allows you to execute PowerShell or Bash scripts on a Windows or Linux VM during first boot. By adding the CSE to your ARM template, you can automate the installation of IIS, copy application files from Azure Storage (using the `fileUris` property), and run a bootstrap script after the OS is provisioned, ensuring the VM is fully configured without manual intervention.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A VM extension such as Custom Script Extension
Why this is correct
A VM extension can run scripted configuration tasks during or after deployment, which fits bootstrap automation.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
An availability set
Why it's wrong here
An availability set affects placement and resiliency, but it cannot install or configure software on the VM.
✗
A managed disk snapshot
Why it's wrong here
A snapshot captures disk state, but it does not execute installation steps during first boot.
✗
A public IP address
Why it's wrong here
A public IP enables connectivity, but it does not automate IIS installation or file copy tasks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a VM extension (which runs scripts post-deployment) with a VM image (which bakes configuration into the OS disk), leading them to think a snapshot or availability set can achieve the same result, but neither can execute commands during first boot.
Detailed technical explanation
How to think about this question
The Custom Script Extension works by downloading scripts from Azure Storage (or a public URL) to the VM and executing them with the specified command. Under the hood, the extension uses the Azure Guest Agent on Windows (or WaAgent on Linux) to manage the lifecycle, and the script output is logged to `C:\WindowsAzure\Logs\Plugins\Microsoft.Compute.CustomScriptExtension` for troubleshooting. A real-world scenario is deploying a web farm where each VM must install IIS and copy application bits from a storage account; using CSE in the ARM template ensures consistency and repeatability across all VMs.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
Deploy and Manage Azure Compute — This question tests Deploy and Manage Azure Compute — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A VM extension such as Custom Script Extension — The Custom Script Extension (CSE) is the correct Azure feature to use because it allows you to execute PowerShell or Bash scripts on a Windows or Linux VM during first boot. By adding the CSE to your ARM template, you can automate the installation of IIS, copy application files from Azure Storage (using the `fileUris` property), and run a bootstrap script after the OS is provisioned, ensuring the VM is fully configured without manual intervention.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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