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 script on VM-App02 immediately after deployment to install a custom monitoring agent. The solution should not require opening additional inbound management ports. What 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.
Boot diagnostics
Why wrong: Boot diagnostics captures console output and screenshots but does not install software.
Custom Script Extension
This is designed to run post-deployment scripts on the VM.
An inbound NSG rule for WinRM
Why wrong: Opening inbound management ports is unnecessary and contrary to the requirement.
A proximity placement group
Why wrong: That feature controls physical placement, not software installation.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Custom Script Extension
The Custom Script Extension (CSE) is the correct choice because it allows you to run a script on a VM immediately after deployment without opening any inbound management ports. CSE downloads and executes scripts on the VM via the Azure fabric, using the VM's outbound connectivity to Azure storage or GitHub, and does not require any inbound port (like RDP or WinRM) to be open. This meets the requirement of not opening additional inbound management ports while enabling post-deployment configuration.
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.
Boot diagnostics
Why it's wrong here
Boot diagnostics captures console output and screenshots but does not install software.
Custom Script Extension
Why this is correct
This is designed to run post-deployment scripts on the VM.
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.
An inbound NSG rule for WinRM
Why it's wrong here
Opening inbound management ports is unnecessary and contrary to the requirement.
A proximity placement group
Why it's wrong here
That feature controls physical placement, not software installation.
Common exam traps
The trap here is that candidates often confuse the Custom Script Extension with other VM management features like boot diagnostics or inbound port rules, mistakenly thinking they need to open a port (like WinRM or SSH) to run a script, when the extension uses the VM's outbound-only communication channel.
Trap categories for this question
Command / output trap
Boot diagnostics captures console output and screenshots but does not install software.
Detailed technical explanation
The Custom Script Extension works by the Azure Guest Agent on the VM polling the extension metadata endpoint (168.63.129.16) for pending extensions. When deployed, the agent downloads the script from the specified URI (Azure Blob, GitHub, etc.) and executes it using the local system account. A subtle behavior is that the script must complete within 90 minutes (the default timeout), and if the VM has no outbound internet access, you must use a storage account with a private endpoint or a SAS URI to provide the script.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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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: Custom Script Extension — The Custom Script Extension (CSE) is the correct choice because it allows you to run a script on a VM immediately after deployment without opening any inbound management ports. CSE downloads and executes scripts on the VM via the Azure fabric, using the VM's outbound connectivity to Azure storage or GitHub, and does not require any inbound port (like RDP or WinRM) to be open. This meets the requirement of not opening additional inbound management ports while enabling post-deployment configuration.
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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Last reviewed: Jun 11, 2026
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