The answer is the Azure VM Agent and the Custom Script Extension. The VM Agent is the foundational service running inside the virtual machine that enables communication with Azure’s control plane, making it a prerequisite for executing any extension, including the Custom Script Extension. The Custom Script Extension then handles the actual bootstrap task—downloading and running your PowerShell or shell script to install a monitoring agent and write configuration files—without requiring any interactive login, and it can be reapplied to a rebuilt VM by redeploying the same ARM template or CLI command. On the AZ-104 exam, this pairing tests your understanding of automated provisioning and the dependency chain: the agent must be present before the extension can run. A common trap is choosing Desired State Configuration (DSC) instead, but DSC is for ongoing configuration drift, not one-time bootstrap scripts. Memory tip: Agent first, then Extension—think of the Agent as the engine and the Extension as the steering wheel.
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.
A Windows VM must run a bootstrap script during provisioning to install a monitoring agent and write configuration files. The administrator does not want to log in interactively, and the script must be runnable again after the VM is rebuilt. Which two Azure compute components should be used? Select two.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure VM Agent
The Azure VM Agent (A) is required because it enables the VM to run extensions, including the Custom Script Extension. The Custom Script Extension (B) is the correct mechanism to execute the bootstrap script during provisioning without interactive login, and it can be reapplied to a rebuilt VM by redeploying the same ARM template or CLI command.
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 VM Agent
Why this is correct
This is the runtime required for Azure to deliver and manage VM extensions.
Related concept
Read the scenario before looking for a memorised answer.
✓
Custom Script Extension
Why this is correct
This extension runs initialization commands and file-copy actions during or after provisioning.
Related concept
Read the scenario before looking for a memorised answer.
✗
Boot diagnostics
Why it's wrong here
Boot diagnostics helps troubleshoot startup, but it does not execute provisioning scripts.
✗
Availability zone
Why it's wrong here
A zone improves resiliency, but it has no role in running post-deployment configuration tasks.
✗
Ephemeral OS disk
Why it's wrong here
An ephemeral OS disk changes disk persistence behavior, but it does not perform scripted setup.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Boot diagnostics (which only shows logs) with a tool that can run scripts, or they mistakenly think Ephemeral OS disks or Availability zones are involved in script execution, when in fact only the VM Agent and Custom Script Extension provide the required automation.
Detailed technical explanation
How to think about this question
The Azure VM Agent (waagent on Linux, WindowsAzureGuestAgent on Windows) runs as a background service and communicates with the Azure Fabric Controller via the WireServer endpoint (168.63.129.16) to handle extension provisioning. The Custom Script Extension downloads and executes scripts from Azure Storage, GitHub, or a public URL, and its state is tracked in the VM's extension metadata, allowing idempotent re-execution on rebuilt VMs by re-running the same deployment command.
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: Azure VM Agent — The Azure VM Agent (A) is required because it enables the VM to run extensions, including the Custom Script Extension. The Custom Script Extension (B) is the correct mechanism to execute the bootstrap script during provisioning without interactive login, and it can be reapplied to a rebuilt VM by redeploying the same ARM template or CLI command.
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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Question Discussion
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