Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A development environment uses temporary test VMs that can be rebuilt at any time. The administrator wants the operating system disk to provide the lowest practical latency and does not need the disk data to survive a deallocate operation. Which OS disk option should be selected?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Ultra Disk managed disk.
Ultra Disk is for high-performance persistent data workloads, not the simplest fit for an OS disk here.
B
Distractor review
Standard HDD managed disk.
This is persistent storage, but it does not offer the lowest latency for temporary workloads.
C
Distractor review
Premium SSD managed disk.
Premium SSD is fast, but it still persists disk data after deallocation.
D
Best answer
Ephemeral OS disk.
Ephemeral OS disks are intended for transient VMs and use local storage for very fast OS disk performance.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?
Question 3
You are deploying a Windows Server VM for an internal app. The VM must support Secure Boot and vTPM later, its OS disk must survive host moves, and the team wants the lowest-cost managed disk tier that still behaves like a normal writable OS disk. Which two choices should you make? Select two.
Question 4
You need to deploy several identical virtual machines and ensure that the failure of a single Azure host does not affect all of them. Which feature should you use?
Question 5
You need to connect VNet-Hub and VNet-Spoke so that resources in both virtual networks can communicate privately over the Microsoft backbone. Both virtual networks are in the same region. What should you configure?
Question 6
You need to create a storage account that provides the lowest-cost redundant storage for non-critical data and only needs protection against local disk or server failure within a single datacenter. Which redundancy option should you choose?
FAQ
Questions learners often ask
What does this AZ-104 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Ephemeral OS disk. — Ephemeral OS disk is the best choice because the workload is disposable and does not need OS disk persistence after deallocation. Using local storage gives very low latency and can improve deployment speed for temporary or rebuildable VMs. The tradeoff is that the operating system disk is not preserved across certain lifecycle events, which is acceptable in this development scenario. Why others are wrong: Standard HDD is too slow for the stated performance goal. Premium SSD is faster, but it remains persistent storage and does not match the need for a nonpersistent OS disk. Ultra Disk is designed for demanding data workloads and is unnecessary complexity for a temporary operating system disk.
What should I do if I get this AZ-104 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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