- A
Create a managed disk from the snapshot.
A snapshot is not directly attached to a VM. You must first create a managed disk from the snapshot so Azure can present it as an attachable storage object.
- B
Attach the restored managed disk to VM-Data01.
After the managed disk is created from the snapshot, attaching it to the VM replaces the corrupted data disk without changing the OS disk. That restores only the affected storage volume.
- C
Redeploy the VM and expect the data disk to revert automatically.
Why wrong: Redeploying a VM changes host placement, not disk contents. It does not roll back a corrupted data disk to a previous snapshot state.
- D
Generalize the VM and redeploy it from the snapshot.
Why wrong: Generalization is a template workflow and does not restore a single data disk. It would add unnecessary disruption and does not target the corrupted volume only.
- E
Replace the snapshot with the current data disk to roll back the VM.
Why wrong: A snapshot is a point-in-time source object, not something you overwrite with the live disk. The direction of restore is snapshot to managed disk, not the reverse.
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 data disk on VM-Data01 was corrupted after a bad patch, and you already have a snapshot taken last night. The OS disk should remain unchanged. Which two actions should you take to restore only the data disk? Select two.
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
Create a managed disk from the snapshot.
Option A is correct because a snapshot is a point-in-time copy of a disk that can be used to create a new managed disk. Since you have a snapshot of the corrupted data disk from last night, creating a managed disk from that snapshot restores the data to its state at the time of the snapshot, leaving the OS disk untouched.
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.
- ✓
Create a managed disk from the snapshot.
Why this is correct
A snapshot is not directly attached to a VM. You must first create a managed disk from the snapshot so Azure can present it as an attachable storage object.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Attach the restored managed disk to VM-Data01.
Why this is correct
After the managed disk is created from the snapshot, attaching it to the VM replaces the corrupted data disk without changing the OS disk. That restores only the affected storage volume.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Redeploy the VM and expect the data disk to revert automatically.
Why it's wrong here
Redeploying a VM changes host placement, not disk contents. It does not roll back a corrupted data disk to a previous snapshot state.
- ✗
Generalize the VM and redeploy it from the snapshot.
Why it's wrong here
Generalization is a template workflow and does not restore a single data disk. It would add unnecessary disruption and does not target the corrupted volume only.
- ✗
Replace the snapshot with the current data disk to roll back the VM.
Why it's wrong here
A snapshot is a point-in-time source object, not something you overwrite with the live disk. The direction of restore is snapshot to managed disk, not the reverse.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse redeploying a VM (which only moves the VM to a new host) with restoring disk data, or mistakenly think a snapshot can be directly attached to a VM without first creating a managed disk.
Detailed technical explanation
How to think about this question
Azure snapshots are incremental, storing only the changes since the last snapshot to optimize cost and storage. When you create a managed disk from a snapshot, Azure allocates a new disk object in the same region and zone as the source, which can then be attached to a VM as a data disk. In a real-world scenario, you would detach the corrupted data disk first, create a new disk from the snapshot, attach it, and then optionally delete the corrupted disk to avoid confusion.
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.
What to study next
Got this wrong? Here's your next step.
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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: Create a managed disk from the snapshot. — Option A is correct because a snapshot is a point-in-time copy of a disk that can be used to create a new managed disk. Since you have a snapshot of the corrupted data disk from last night, creating a managed disk from that snapshot restores the data to its state at the time of the snapshot, leaving the OS disk untouched.
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
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