- A
Run `az vm stop`, then resize the VM.
Why wrong: Stopping the VM powers it off, but it may not release the allocated host resources needed for the resize operation.
- B
Run `az vm deallocate`, then resize the VM, then start it again.
Azure often requires the VM to be deallocated before a size change succeeds because the target size may need different host resources. Deallocation releases the current compute allocation, which lets Azure place the VM on compatible hardware. After resizing, you start the VM again and the new size takes effect. This is the key difference between stop and deallocate in Azure operations.
- C
Run `az vm restart`, then resize the VM.
Why wrong: Restarting reboots the operating system, but it does not release the VM from its current compute allocation.
- D
Run `az vm generalize`, then recreate the VM from the image.
Why wrong: Generalizing is used for reusable images, not for a routine resize of an existing production VM.
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 resize a production VM from Standard_D2s_v5 to Standard_D4s_v5 by using Azure CLI. `az vm list-vm-resize-options` shows the target size, but `az vm resize` fails while the VM is running. Which action should you take first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
Run `az vm deallocate`, then resize the VM, then start it again.
Option B is correct because resizing a VM to a different size often requires the VM to be in a deallocated state, especially when the new size is in a different hardware cluster or when the VM is currently running and the resize operation fails. The `az vm deallocate` command releases the underlying hardware resources, allowing the VM to be resized to any available size, including Standard_D4s_v5, and then you can start it again. This is a common requirement for production VMs when live resizing is not supported or fails.
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.
- ✗
Run `az vm stop`, then resize the VM.
Why it's wrong here
Stopping the VM powers it off, but it may not release the allocated host resources needed for the resize operation.
When this WOULD be correct
If the question specified that the target size is available in the same cluster and the VM needs only a brief pause (e.g., for a quick configuration change), stopping the VM would be sufficient and faster than deallocating.
- ✓
Run `az vm deallocate`, then resize the VM, then start it again.
Why this is correct
Azure often requires the VM to be deallocated before a size change succeeds because the target size may need different host resources. Deallocation releases the current compute allocation, which lets Azure place the VM on compatible hardware. After resizing, you start the VM again and the new size takes effect. This is the key difference between stop and deallocate in Azure operations.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Run `az vm restart`, then resize the VM.
Why it's wrong here
Restarting reboots the operating system, but it does not release the VM from its current compute allocation.
When this WOULD be correct
If the question described a scenario where the VM needs to apply a new configuration or update that only takes effect after a reboot (e.g., changing disk caching settings or installing a driver), then running `az vm restart` before the operation would be the correct first step.
- ✗
Run `az vm generalize`, then recreate the VM from the image.
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.
✓Run `az vm deallocate`, then resize the VM, then start it again.Correct answer▾
Why this is correct
Azure often requires the VM to be deallocated before a size change succeeds because the target size may need different host resources. Deallocation releases the current compute allocation, which lets Azure place the VM on compatible hardware. After resizing, you start the VM again and the new size takes effect. This is the key difference between stop and deallocate in Azure operations.
✗Run `az vm stop`, then resize the VM.Wrong answer — click to see why▾
Why this is wrong here
Stopping a VM (az vm stop) does not release the underlying hardware resources; resizing may still fail if the target size is unavailable in the current cluster. Deallocation is required to free the VM from its host and allow resizing to any size.
★ When this WOULD be the correct answer
If the question specified that the target size is available in the same cluster and the VM needs only a brief pause (e.g., for a quick configuration change), stopping the VM would be sufficient and faster than deallocating.
Why candidates choose this
Candidates may think stopping the VM is enough to resize, confusing 'stop' with 'deallocate', or they may want to minimize downtime by avoiding the longer deallocation process.
✗Run `az vm restart`, then resize the VM.Wrong answer — click to see why▾
Why this is wrong here
Restarting the VM does not change its allocation state; the resize operation requires the VM to be in a deallocated state (stopped and de-provisioned) to change the VM size, as the new size may require different resources. A restart only reboots the VM without releasing the underlying hardware.
★ When this WOULD be the correct answer
If the question described a scenario where the VM needs to apply a new configuration or update that only takes effect after a reboot (e.g., changing disk caching settings or installing a driver), then running `az vm restart` before the operation would be the correct first step.
Why candidates choose this
Candidates may think that restarting the VM is sufficient to free up resources or reset the state, similar to how a reboot can resolve some software issues, but they overlook that Azure VM resizing requires deallocation to release the current hardware allocation.
✗Run `az vm generalize`, then recreate the VM from the image.Wrong answer — click to see why▾
Why this is wrong here
Generalize prepares the VM for image creation and is not used for resizing; it would require recreating the VM, which is unnecessary and disruptive for a simple resize operation.
★ When this WOULD be the correct answer
When you need to capture a generalized image of a VM to reuse in multiple deployments, such as creating a custom image from a configured VM for scaling out.
Why candidates choose this
Candidates may confuse the steps for resizing with those for creating a reusable image, or they might think generalize is a necessary step before any major VM modification.
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 'stop' with 'deallocate' — while both halt the VM, only deallocate releases the underlying hardware reservation, which is necessary for resizing across different hardware clusters or when live resize fails.
Detailed technical explanation
How to think about this question
Under the hood, Azure VMs are allocated to specific hardware clusters based on their size family. When you attempt to resize a running VM to a size that is not supported on the current cluster (e.g., moving from a general-purpose D-series to a memory-optimized E-series), the resize fails unless the VM is deallocated, which releases the cluster lock and allows Azure to place the VM on a new cluster that supports the target size. This behavior is governed by Azure Resource Manager's allocation logic, which checks for capacity and compatibility at the cluster level. In real-world scenarios, deallocation is also required when resizing to a size that requires a different number of vCPUs or memory that exceeds the current host's capacity.
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: Run `az vm deallocate`, then resize the VM, then start it again. — Option B is correct because resizing a VM to a different size often requires the VM to be in a deallocated state, especially when the new size is in a different hardware cluster or when the VM is currently running and the resize operation fails. The `az vm deallocate` command releases the underlying hardware resources, allowing the VM to be resized to any available size, including Standard_D4s_v5, and then you can start it again. This is a common requirement for production VMs when live resizing is not supported or fails.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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