- A
Boot diagnostics
Why wrong: Boot diagnostics helps investigate startup issues but does not run scripts.
- B
A Custom Script Extension
The Custom Script Extension is used to run scripts on Azure VMs.
- C
Azure Policy
Why wrong: Azure Policy enforces governance rules, not guest OS script execution.
- D
An availability set
Why wrong: Availability sets organize VMs for resilience, not configuration automation.
Question 543 of 1,170
Azure Custom Script Extension: Startup Script Execution
This AZ-104 practice question tests your understanding of deploy and manage azure compute. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 scheduled script on an Azure virtual machine every time the VM starts. Which feature should you use?
Answer choices
Why each option matters
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 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.
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.
- ✗
Boot diagnostics
Why it's wrong here
Boot diagnostics helps investigate startup issues but does not run scripts.
When this WOULD be correct
You need to troubleshoot why a VM is not booting properly and want to view the console output or screenshot of the boot process to identify the issue.
- ✓
A Custom Script Extension
Why this is correct
The Custom Script Extension is used to run scripts on Azure VMs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Policy
Why it's wrong here
Azure Policy enforces governance rules, not guest OS script execution.
When this WOULD be correct
When the question asks how to ensure that all VMs in a subscription have a specific configuration (e.g., a tag or encryption) enforced automatically, Azure Policy would be the correct answer.
- ✗
An availability set
Why it's wrong here
Availability sets organize VMs for resilience, not configuration automation.
When this WOULD be correct
When the question asks for a solution to ensure high availability of a multi-tier application by distributing VMs across fault domains and update domains, an availability set would be the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓A Custom Script ExtensionCorrect answer▾
Why this is correct
The Custom Script Extension is used to run scripts on Azure VMs.
✗Boot diagnosticsWrong answer — click to see why▾
Why this is wrong here
Boot diagnostics captures serial output and screenshots for troubleshooting VM boot failures, but it cannot run scripts or automate tasks on VM start.
★ When this WOULD be the correct answer
You need to troubleshoot why a VM is not booting properly and want to view the console output or screenshot of the boot process to identify the issue.
Why candidates choose this
Candidates may confuse boot diagnostics with startup automation because both involve the VM boot process, leading them to think it can execute scripts.
✗Azure PolicyWrong answer — click to see why▾
Why this is wrong here
Azure Policy is used to enforce compliance rules and governance across resources, not to run scripts on VM startup. It cannot execute scheduled scripts on a VM.
★ When this WOULD be the correct answer
When the question asks how to ensure that all VMs in a subscription have a specific configuration (e.g., a tag or encryption) enforced automatically, Azure Policy would be the correct answer.
Why candidates choose this
Candidates may confuse policy-based management with automation tasks, thinking Azure Policy can trigger script execution as part of compliance enforcement.
✗An availability setWrong answer — click to see why▾
Why this is wrong here
An availability set is a logical grouping of VMs to ensure high availability during planned or unplanned maintenance, not for executing scripts on VM start.
★ When this WOULD be the correct answer
When the question asks for a solution to ensure high availability of a multi-tier application by distributing VMs across fault domains and update domains, an availability set would be the correct answer.
Why candidates choose this
Candidates may confuse the term 'availability' with 'automation' or think that availability sets can trigger actions, but they are purely for redundancy and uptime.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Boot diagnostics (which only provides logs/screenshots) with a feature that actually executes code, leading candidates to select A instead of B.
Detailed technical explanation
How to think about this question
Under the hood, the Custom Script Extension uses the Azure VM Agent to download and run scripts specified via protected or public settings. For startup execution, you can combine CSE with a scheduled task or use the 'commandToExecute' property in the extension profile during VM creation or update. A real-world scenario is installing monitoring agents or applying security patches on every boot, where CSE ensures the script runs even after VM deallocation and restart.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-104 question test?
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 Custom Script Extension — 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.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.
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