The answer is the Custom Script Extension, which is the correct Azure feature for running scripts on a Windows VM immediately after deployment without manual sign-in. This virtual machine extension automates post-deployment tasks by executing PowerShell or Bash scripts during provisioning, enabling you to install IIS and run configuration scripts seamlessly. On the AZ-104 exam, this scenario tests your understanding of Azure VM extensions versus alternatives like Desired State Configuration (DSC) or Run Command—a common trap is confusing CSE with DSC, but remember that CSE is simpler for one-time script execution at deployment, while DSC manages ongoing configuration state. The search intent for "custom script extension post-deployment" highlights its role in zero-touch automation, a key skill for Azure administrators. Memory tip: Think "CSE for one-and-done scripts, DSC for keep-it-done."
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.
Exhibit
Deployment requirement:
1. Create a new Windows VM from a standard image.
2. Install IIS after the VM is provisioned.
3. Run C:\Setup\install.ps1 automatically.
4. No interactive logon is allowed during deployment.
Based on the exhibit, a Windows VM must install IIS and run a configuration script automatically right after deployment. The administrator does not want to sign in to the VM manually. Which Azure feature should be used?
Deployment requirement:
1. Create a new Windows VM from a standard image.
2. Install IIS after the VM is provisioned.
3. Run C:\Setup\install.ps1 automatically.
4. No interactive logon is allowed during deployment.
A
Azure Policy with a modify effect.
Why wrong: Azure Policy can enforce configuration or add properties, but it does not execute a post-deployment script on the VM.
B
Virtual machine extension, such as the Custom Script Extension.
A VM extension is designed to run guest-level tasks after the VM is created. The Custom Script Extension can download and execute a script to install IIS or perform configuration without requiring manual sign-in. This is the standard Azure feature for simple post-deployment automation on a VM.
C
An availability set.
Why wrong: An availability set improves resilience across update and fault domains, but it does not install software or run scripts.
D
A private endpoint.
Why wrong: A private endpoint provides private network access to a PaaS service and is unrelated to executing scripts on a VM.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Virtual machine extension, such as the Custom Script Extension.
The Custom Script Extension (CSE) is the correct Azure feature because it allows you to run PowerShell or Bash scripts on a VM after deployment without manual sign-in. By specifying the script in the VM's deployment template or via Azure CLI/Portal, IIS can be installed and the configuration script executed automatically during provisioning. This aligns with the requirement for zero-touch post-deployment automation.
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.
✗
Azure Policy with a modify effect.
Why it's wrong here
Azure Policy can enforce configuration or add properties, but it does not execute a post-deployment script on the VM.
✓
Virtual machine extension, such as the Custom Script Extension.
Why this is correct
A VM extension is designed to run guest-level tasks after the VM is created. The Custom Script Extension can download and execute a script to install IIS or perform configuration without requiring manual sign-in. This is the standard Azure feature for simple post-deployment automation on a VM.
Related concept
Read the scenario before looking for a memorised answer.
✗
An availability set.
Why it's wrong here
An availability set improves resilience across update and fault domains, but it does not install software or run scripts.
✗
A private endpoint.
Why it's wrong here
A private endpoint provides private network access to a PaaS service and is unrelated to executing scripts on a VM.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Policy (which can only audit or remediate resource configurations at the ARM level) with the ability to run guest OS scripts, mistakenly thinking a 'modify effect' can install software, when in fact it cannot execute code inside the VM.
Detailed technical explanation
How to think about this question
Under the hood, the Custom Script Extension downloads the script from Azure Storage (or a public URL) and executes it using the VM agent (Windows: WindowsAzureGuestAgent). The script runs as the local system account, and any output or errors are logged to the Windows Event Log under 'CustomScriptExtension'. A subtle behavior: if the script fails, the extension reports a failure status, but the VM remains running; you must handle idempotency in your script to avoid issues on re-runs.
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
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.
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: Virtual machine extension, such as the Custom Script Extension. — The Custom Script Extension (CSE) is the correct Azure feature because it allows you to run PowerShell or Bash scripts on a VM after deployment without manual sign-in. By specifying the script in the VM's deployment template or via Azure CLI/Portal, IIS can be installed and the configuration script executed automatically during provisioning. This aligns with the requirement for zero-touch post-deployment automation.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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