The answer is Azure App Service, the fully managed Platform-as-a-Service (PaaS) web app hosting solution that meets all the requirements. This service is correct because it provides built-in autoscaling rules that automatically adjust compute resources based on traffic demand, while eliminating the need to manage any virtual machines or operating systems. Azure App Service also guarantees high availability through its SLA-backed multi-instance deployment and supports a wide range of development frameworks including .NET, Java, Node.js, Python, and PHP. On the AZ-900 exam, this scenario tests your understanding of PaaS versus IaaS—a common trap is choosing Virtual Machine Scale Sets, which still require OS management. Remember that if the question says “no VM management” and “multiple frameworks,” you should immediately think of App Service. A helpful memory tip: “App Service = App without the server work,” linking the name directly to its PaaS nature.
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 application that automatically scales based on traffic, without managing any virtual machines. They need high availability and support for multiple development frameworks. Which Azure service should they use?
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 automatically scales web applications based on traffic using built-in autoscale rules, without requiring any virtual machine management. It provides high availability through its SLA-backed multi-instance deployment and supports multiple development frameworks including .NET, Java, Node.js, Python, and PHP, making it the ideal choice for this scenario.
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
VMs require managing the underlying operating system and do not provide automatic scaling without additional configuration.
✓
Azure App Service
Why this is correct
App Service is a PaaS offering that handles scaling, patching, and availability, and supports multiple frameworks.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Functions
Why it's wrong here
Functions is for event-driven serverless compute, not designed for hosting a full web application.
✗
Azure Kubernetes Service
Why it's wrong here
AKS provides orchestration for containers but still requires managing the cluster nodes and is more complex than needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Functions (serverless, event-driven) with Azure App Service (PaaS for full web apps), but Functions lacks support for multiple development frameworks in a single application and is not designed for persistent, stateful web applications.
Detailed technical explanation
How to think about this question
Azure App Service uses the Azure WebJobs SDK and a sandboxed runtime environment (the 'App Service sandbox') to isolate each application while sharing underlying worker processes. Under the hood, autoscaling is driven by Azure Monitor metrics (e.g., CPU percentage, memory percentage, HTTP queue length) and can scale out to up to 30 instances per App Service Plan (or 100 with ASE). A real-world scenario: an e-commerce site using App Service can automatically scale from 1 to 20 instances during Black Friday traffic spikes, then scale back down, all without any infrastructure provisioning.
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 automatically scales web applications based on traffic using built-in autoscale rules, without requiring any virtual machine management. It provides high availability through its SLA-backed multi-instance deployment and supports multiple development frameworks including .NET, Java, Node.js, Python, and PHP, making it the ideal choice for this scenario.
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.
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Variation 1. A company wants to host a web application that automatically scales based on traffic. Which Azure service is most appropriate for hosting this application without managing virtual machines?
medium
A.Azure Virtual Machines
✓ B.Azure App Service
C.Azure Batch
D.Azure Container Instances
Why B: Azure App Service is a fully managed platform-as-a-service (PaaS) offering that automatically scales web applications based on traffic without requiring you to manage the underlying virtual machines. It supports built-in autoscaling rules, load balancing, and high availability, making it ideal for hosting web apps with variable demand.
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Question Discussion
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