- A
A Virtual Machine Scale Set
Scale Sets provide autoscaling and centralized management for identical VM instances.
- B
An availability set
Why wrong: Availability sets improve resiliency but do not provide autoscaling.
- C
A Recovery Services vault
Why wrong: A Recovery Services vault is used for backup and recovery.
- D
Boot diagnostics
Why wrong: Boot diagnostics is used to troubleshoot startup problems and does not manage fleets.
Question 434 of 1,170
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 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?
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
✓
A Virtual Machine Scale Set
A Virtual Machine Scale Set (VMSS) is the correct Azure compute feature because it automatically manages a group of identical, load-balanced VMs that can scale in and out based on CPU demand using autoscale rules. It treats all instances as a single logical group, enabling unified management, patching, and application deployment, which is exactly what the stateless web application requires.
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.
- ✓
A Virtual Machine Scale Set
Why this is correct
Scale Sets provide autoscaling and centralized management for identical VM instances.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
An availability set
Why it's wrong here
Availability sets improve resiliency but do not provide autoscaling.
When this WOULD be correct
You need to ensure that two or more VMs hosting a critical database remain available during planned maintenance and hardware failures. An availability set would be the correct choice to distribute VMs across fault and update domains.
- ✗
A Recovery Services vault
Why it's wrong here
A Recovery Services vault is used for backup and recovery.
When this WOULD be correct
You need to protect Azure VMs by enabling backup and restore capabilities, including application-consistent backups and long-term retention policies.
- ✗
Boot diagnostics
Why it's wrong here
Boot diagnostics is used to troubleshoot startup problems and does not manage fleets.
When this WOULD be correct
You need to troubleshoot why a specific Azure VM is not booting properly after a configuration change. Boot diagnostics would be the correct feature to enable to capture boot logs and screenshots for analysis.
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.
✓A Virtual Machine Scale SetCorrect answer▾
Why this is correct
Scale Sets provide autoscaling and centralized management for identical VM instances.
✗An availability setWrong answer — click to see why▾
Why this is wrong here
An availability set only provides high availability by distributing VMs across fault and update domains, but it does not support automatic scaling or management as a single logical group for a stateless web application.
★ When this WOULD be the correct answer
You need to ensure that two or more VMs hosting a critical database remain available during planned maintenance and hardware failures. An availability set would be the correct choice to distribute VMs across fault and update domains.
Why candidates choose this
Candidates may confuse availability sets with scale sets because both involve multiple VMs, and they might think availability sets also provide scaling capabilities.
✗A Recovery Services vaultWrong answer — click to see why▾
Why this is wrong here
A Recovery Services vault is used for backup and disaster recovery, not for scaling or managing virtual machines as a group.
★ When this WOULD be the correct answer
You need to protect Azure VMs by enabling backup and restore capabilities, including application-consistent backups and long-term retention policies.
Why candidates choose this
Candidates may confuse 'Recovery Services' with 'scaling' or 'management' due to the word 'Services', or think it provides some form of group management for VMs.
✗Boot diagnosticsWrong answer — click to see why▾
Why this is wrong here
Boot diagnostics is a feature for troubleshooting VM boot failures by capturing serial console output and screenshots, not for scaling or managing instances as a group.
★ When this WOULD be the correct answer
You need to troubleshoot why a specific Azure VM is not booting properly after a configuration change. Boot diagnostics would be the correct feature to enable to capture boot logs and screenshots for analysis.
Why candidates choose this
Candidates may confuse boot diagnostics with a management or monitoring feature, thinking it helps manage multiple instances, but it is solely for debugging boot issues on individual VMs.
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 an availability set (which provides high availability) with a scale set (which provides both high availability and automatic scaling), leading them to select availability set when the question explicitly requires automatic scaling and logical group management.
Detailed technical explanation
How to think about this question
VMSS uses an autoscale engine that evaluates CPU metrics (or other performance counters) against thresholds defined in autoscale rules, triggering scale-out or scale-in operations via the Azure Resource Manager API. Under the hood, VMSS leverages a virtual machine profile and an orchestration mode (uniform or flexible) to manage instance creation, with load balancing integrated through Azure Load Balancer or Application Gateway. A real-world scenario is an e-commerce site during a flash sale where CPU demand spikes; VMSS can automatically add instances in minutes and remove them when demand drops, ensuring cost efficiency and performance.
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: A Virtual Machine Scale Set — A Virtual Machine Scale Set (VMSS) is the correct Azure compute feature because it automatically manages a group of identical, load-balanced VMs that can scale in and out based on CPU demand using autoscale rules. It treats all instances as a single logical group, enabling unified management, patching, and application deployment, which is exactly what the stateless web application requires.
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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