Quick Answer
The answer is a Virtual Machine Scale Set. This 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, treating all instances as a single logical group for unified management, patching, and application deployment—exactly what a stateless web application requires. On the AZ-104 exam, this scenario tests your understanding of the core difference between scale sets and availability sets: scale sets handle elasticity and autoscaling, while availability sets only provide fault domain redundancy for high availability. A common trap is choosing an availability set because it sounds like it handles scaling, but it does not—it only protects against hardware failures. For a quick memory tip, remember that “Scale” is in the name of a scale set, and it is the only option that automatically adds and removes instances based on demand.
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?
A Virtual Machine Scale Set
Scale Sets provide autoscaling and centralized management for identical VM instances.
An availability set
Why wrong: Availability sets improve resiliency but do not provide autoscaling.
A Recovery Services vault
Why wrong: A Recovery Services vault is used for backup and recovery.
Boot diagnostics
Why wrong: Boot diagnostics is used to troubleshoot startup problems and does not manage fleets.
Answer choices
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
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.
A Recovery Services vault
Why it's wrong here
A Recovery Services vault is used for backup and recovery.
Boot diagnostics
Why it's wrong here
Boot diagnostics is used to troubleshoot startup problems and does not manage fleets.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Deploy and Manage Azure Compute — This question tests Deploy and Manage Azure Compute — Read the scenario before looking for a memorised answer..
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company hosts a stateless web application behind a load balancer. Traffic increases during the day and drops at night. The team wants Azure to automatically add or remove identical VM instances based on demand. What should the administrator deploy?
easyWhy B: A virtual machine scale set (VMSS) is the correct choice because it automatically manages a group of identical, load-balanced VMs and can scale out (add VMs) or scale in (remove VMs) based on demand metrics like CPU usage or a schedule. This matches the requirement for a stateless web application with variable traffic, as VMSS integrates with Azure Load Balancer or Application Gateway and supports autoscale rules to handle daytime spikes and nighttime drops without manual intervention.
Variation 2. A stateless web application is hosted on an Azure virtual machine scale set. Traffic is predictable: CPU usage stays below 20% overnight, then rises above 70% during business hours. The administrator wants the instance count to increase automatically when average CPU stays high for 10 minutes and to decrease after demand drops. What should be configured?
mediumWhy C: Autoscale rules on the virtual machine scale set allow the administrator to define a scale-out condition (e.g., average CPU > 70% for 10 minutes) and a scale-in condition (e.g., average CPU < 20% for a specified duration). This matches the requirement for automatic, metric-based scaling based on predictable traffic patterns.
Last reviewed: Jun 11, 2026
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