The answer is Azure App Service. This is the correct choice because Azure App Service is a fully managed platform-as-a-service (PaaS) offering that abstracts away virtual machines and underlying infrastructure, allowing developers to simply upload their code and rely on built-in autoscaling, load balancing, and automatic patching to handle demand. On the Microsoft Azure Fundamentals AZ-900 exam, this scenario tests your understanding of PaaS versus IaaS models—a common trap is confusing Azure App Service with Azure Virtual Machines, which require manual scaling and infrastructure management. Remember that if the question emphasizes “no infrastructure management” and “autoscaling,” the answer is almost always a PaaS service like App Service, not a compute option like VMs or Azure Functions (which is event-driven, not for continuous web apps). A useful memory tip: think of App Service as “appliance service”—you plug in your code and it runs itself, scaling up and down like a smart appliance.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
A company wants to deploy a web app that scales automatically based on demand. They do not want to manage any virtual machines or the underlying infrastructure. They only want to upload their code and let the platform handle everything. Which Azure compute service should they choose?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure App Service
Azure App Service is a fully managed platform-as-a-service (PaaS) offering that enables developers to deploy web applications without managing virtual machines or underlying infrastructure. It provides built-in autoscaling, load balancing, and patching, allowing the company to simply upload their code and let the platform handle scaling based on demand.
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.
✗
Azure Virtual Machines
Why it's wrong here
Azure VMs require you to manage the OS, updates, and scaling configuration.
✓
Azure App Service
Why this is correct
Azure App Service is a PaaS service that provides built-in auto-scaling and infrastructure management.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Functions
Why it's wrong here
Azure Functions is for event-driven, short-lived code, not full web applications.
✗
Azure Container Instances
Why it's wrong here
Azure Container Instances runs containers without scaling built-in like App Service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Functions (serverless) with Azure App Service, but Functions is not designed for hosting a full web app with persistent HTTP endpoints and built-in autoscaling for continuous traffic.
Detailed technical explanation
How to think about this question
Azure App Service supports automatic scaling through autoscale rules based on metrics like CPU percentage or HTTP queue length, and it can scale out to multiple instances across availability zones. Under the hood, it uses a shared front-end load balancer and a scale controller that monitors demand and adjusts the number of worker instances, while the platform handles OS patching and runtime updates. In a real-world scenario, a company with a marketing campaign causing traffic spikes can rely on App Service's autoscaling to add instances without any manual intervention, ensuring high availability.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure App Service — Azure App Service is a fully managed platform-as-a-service (PaaS) offering that enables developers to deploy web applications without managing virtual machines or underlying infrastructure. It provides built-in autoscaling, load balancing, and patching, allowing the company to simply upload their code and let the platform handle scaling based on demand.
What should I do if I get this AZ-900 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
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Variation 1. A company needs to host a website that must automatically scale to handle millions of concurrent users during peak events. Which Azure architecture BEST supports this?
medium
A.Single Azure VM with manual scaling
✓ B.Azure App Service with autoscaling and Azure Front Door
C.Azure Blob Storage static website
D.Azure VMs without load balancing
Why B: Azure App Service with autoscaling and Azure Front Door is the best choice because it provides a fully managed platform for web applications that can automatically scale out (add instances) based on demand, while Azure Front Door offers global load balancing and acceleration at Layer 7 (HTTP/HTTPS) to distribute traffic across multiple regions. This combination ensures the website can handle millions of concurrent users during peak events without manual intervention.
Last reviewed: Jun 11, 2026
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