AZ-104 Monitor and Maintain Azure Resources Practice Question
This AZ-104 practice question tests your understanding of monitor and maintain azure resources. 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
Recovery Services vault > Backup item: vm-web02
Available recovery points: 5
Current VM status: Running
Issue reported: OS disk corruption after patching
Requirement: repair the VM without rebuilding networking or re-registering the VM
Based on the exhibit, the OS disk on a production VM is corrupted, but the VM must stay in place and keep its NIC and data disks. Which restore option should you choose?
Exhibit
Recovery Services vault > Backup item: vm-web02
Available recovery points: 5
Current VM status: Running
Issue reported: OS disk corruption after patching
Requirement: repair the VM without rebuilding networking or re-registering the VM
A
Restore the VM as a new virtual machine and delete the existing one immediately.
Why wrong: A full VM restore can create a replacement VM, but the requirement says to keep the current VM in place and avoid rebuilding networking. That makes this option unnecessarily disruptive.
B
Restore the disk, then attach or swap it as needed to repair the existing VM.
When the VM still exists but one disk is corrupted, restoring the disk is the correct approach. It lets you recover the damaged OS disk from a backup point and then attach or swap it without rebuilding the VM identity, NIC, or data disk layout. This is a common recovery pattern for targeted repair.
C
Use Azure Monitor to roll back the last deployment automatically.
Why wrong: Azure Monitor observes and alerts on issues; it does not restore disks or roll back VM configurations. Recovery must come from Azure Backup.
D
Enable a diagnostic setting on the VM so the OS disk will be repaired.
Why wrong: Diagnostic settings collect logs and metrics, but they do not repair corrupted disks or provide disk recovery capabilities.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Restore the disk, then attach or swap it as needed to repair the existing VM.
Option B is correct because when an OS disk is corrupted, you can restore just the disk from a recovery point and then either attach it as a data disk to the existing VM or swap the OS disk. This approach preserves the VM's NIC, data disks, and IP configuration, meeting the requirement to keep the VM in place.
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.
✗
Restore the VM as a new virtual machine and delete the existing one immediately.
Why it's wrong here
A full VM restore can create a replacement VM, but the requirement says to keep the current VM in place and avoid rebuilding networking. That makes this option unnecessarily disruptive.
When this WOULD be correct
This option would be correct if the question required replacing the VM entirely (e.g., due to severe corruption) and the new VM could be configured with the same NIC and data disks, or if the original VM's resources were to be released immediately after restoration.
✓
Restore the disk, then attach or swap it as needed to repair the existing VM.
Why this is correct
When the VM still exists but one disk is corrupted, restoring the disk is the correct approach. It lets you recover the damaged OS disk from a backup point and then attach or swap it without rebuilding the VM identity, NIC, or data disk layout. This is a common recovery pattern for targeted repair.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Azure Monitor to roll back the last deployment automatically.
Why it's wrong here
Azure Monitor observes and alerts on issues; it does not restore disks or roll back VM configurations. Recovery must come from Azure Backup.
When this WOULD be correct
If a VM deployment fails due to a configuration error and you need to revert to the last successful deployment state, you could use Azure Monitor to trigger a rollback via Azure Automation or a runbook, but this is not a standard restore operation.
✗
Enable a diagnostic setting on the VM so the OS disk will be repaired.
Why it's wrong here
Diagnostic settings collect logs and metrics, but they do not repair corrupted disks or provide disk recovery capabilities.
When this WOULD be correct
This option would be correct if the question asked: 'You need to collect boot diagnostics logs to troubleshoot why a VM is not starting. Which action should you take?'
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.
✓Restore the disk, then attach or swap it as needed to repair the existing VM.Correct answer▾
Why this is correct
When the VM still exists but one disk is corrupted, restoring the disk is the correct approach. It lets you recover the damaged OS disk from a backup point and then attach or swap it without rebuilding the VM identity, NIC, or data disk layout. This is a common recovery pattern for targeted repair.
✗Restore the VM as a new virtual machine and delete the existing one immediately.Wrong answer — click to see why▾
Why this is wrong here
Restoring the VM as a new virtual machine and deleting the existing one would change the VM's identity, NIC, and data disk attachments, violating the requirement to keep the VM in place with its NIC and data disks.
★ When this WOULD be the correct answer
This option would be correct if the question required replacing the VM entirely (e.g., due to severe corruption) and the new VM could be configured with the same NIC and data disks, or if the original VM's resources were to be released immediately after restoration.
Why candidates choose this
Candidates may think that creating a new VM from a restore point is the only way to recover, overlooking the ability to restore just the disk and swap it into the existing VM.
✗Use Azure Monitor to roll back the last deployment automatically.Wrong answer — click to see why▾
Why this is wrong here
Azure Monitor is a monitoring and diagnostics service, not a backup or restore tool. It cannot roll back deployments or repair corrupted OS disks.
★ When this WOULD be the correct answer
If a VM deployment fails due to a configuration error and you need to revert to the last successful deployment state, you could use Azure Monitor to trigger a rollback via Azure Automation or a runbook, but this is not a standard restore operation.
Why candidates choose this
Candidates may confuse Azure Monitor's diagnostic and alerting capabilities with recovery features, or think it can automatically fix issues like a corrupted disk.
✗Enable a diagnostic setting on the VM so the OS disk will be repaired.Wrong answer — click to see why▾
Why this is wrong here
Enabling a diagnostic setting on the VM does not repair a corrupted OS disk; it only collects logs and metrics. It cannot restore or fix disk corruption.
★ When this WOULD be the correct answer
This option would be correct if the question asked: 'You need to collect boot diagnostics logs to troubleshoot why a VM is not starting. Which action should you take?'
Why candidates choose this
Candidates may confuse diagnostic settings with repair capabilities, thinking that enabling diagnostics can automatically fix disk issues.
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 that candidates often confuse Azure Monitor with Azure Backup or Site Recovery, assuming monitoring can perform recovery actions, when in fact only backup-based disk restoration can repair a corrupted OS disk while keeping the VM in place.
Detailed technical explanation
How to think about this question
Azure VM disk restoration uses the 'Restore disks' option in Azure Backup, which creates a managed disk from a recovery point. You can then use the 'Swap OS disk' feature in the Azure portal to replace the corrupted OS disk with the restored disk without deleting the VM, preserving the VM's resource ID, NIC, and data disks. This process leverages Azure Resource Manager's ability to update the VM's storage profile while the VM remains in a stopped state.
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.
Monitor and Maintain Azure Resources — This question tests Monitor and Maintain Azure Resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Restore the disk, then attach or swap it as needed to repair the existing VM. — Option B is correct because when an OS disk is corrupted, you can restore just the disk from a recovery point and then either attach it as a data disk to the existing VM or swap the OS disk. This approach preserves the VM's NIC, data disks, and IP configuration, meeting the requirement to keep the VM in place.
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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