- A
Azure Container Instances
Why wrong: ACI allows running containers without managing VMs, but it lacks orchestration features like automatic scaling, service discovery, and rolling updates across multiple containers.
- B
Azure Kubernetes Service (AKS)
AKS is a fully managed Kubernetes service that provides orchestration, automatic scaling, service discovery, and rolling updates. It offloads the management of the control plane to Azure.
- C
Azure App Service
Why wrong: App Service can host containerized apps, but it is primarily for web apps and APIs. It does not offer the same level of container orchestration as AKS.
- D
Azure Functions
Why wrong: Azure Functions is a serverless compute service for event-driven code. It is not designed for running long-running containerized microservices with complex orchestration.
Quick Answer
The correct choice is Azure Kubernetes Service (AKS) because it is the fully managed Kubernetes offering that natively provides automatic scaling through the Horizontal Pod Autoscaler, built-in service discovery via Kubernetes DNS and Services, and rolling updates using Deployment strategies—all without requiring you to manage the underlying virtual machines. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of when to choose a container orchestration service versus a simpler compute option like Azure Container Instances; a common trap is selecting Azure Container Instances for microservices, but AKS is required for the orchestration features like scaling and rolling updates. Remember the mnemonic “AKS Does It All”—Autoscaling, Kubernetes service discovery, and Seamless updates—to quickly identify it as the answer for managed microservices with zero VM management.
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 run a containerized microservices application on Azure. The application requires automatic scaling, service discovery, and rolling updates without manual intervention. They prefer not to manage the underlying virtual machines. Which Azure compute service should they choose?
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
Azure Kubernetes Service (AKS)
Azure Kubernetes Service (AKS) is the correct choice because it provides a fully managed Kubernetes orchestration platform that handles automatic scaling (via Horizontal Pod Autoscaler), service discovery (via Kubernetes DNS and Services), and rolling updates (via Deployment strategies) without requiring you to manage the underlying virtual machines. AKS abstracts the control plane and node management, allowing you to focus on deploying and managing containerized microservices.
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 Container Instances
Why it's wrong here
ACI allows running containers without managing VMs, but it lacks orchestration features like automatic scaling, service discovery, and rolling updates across multiple containers.
- ✓
Azure Kubernetes Service (AKS)
Why this is correct
AKS is a fully managed Kubernetes service that provides orchestration, automatic scaling, service discovery, and rolling updates. It offloads the management of the control plane to Azure.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure App Service
Why it's wrong here
App Service can host containerized apps, but it is primarily for web apps and APIs. It does not offer the same level of container orchestration as AKS.
- ✗
Azure Functions
Why it's wrong here
Azure Functions is a serverless compute service for event-driven code. It is not designed for running long-running containerized microservices with complex orchestration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Container Instances (ACI) with AKS because both run containers, but ACI lacks orchestration features like automatic scaling, service discovery, and rolling updates, which are essential for multi-container microservices applications.
Detailed technical explanation
How to think about this question
Under the hood, AKS manages the Kubernetes control plane (including the API server, etcd, and scheduler) as a managed service, while you define node pools using virtual machine scale sets for worker nodes. The Horizontal Pod Autoscaler uses the Kubernetes metrics API to adjust pod replicas based on CPU/memory or custom metrics, and rolling updates are controlled by the Deployment controller, which gradually replaces pods with zero downtime. A real-world scenario is a microservices-based e-commerce platform that needs to handle traffic spikes during sales events; AKS can automatically scale pods and services while maintaining service discovery via internal DNS records (e.g., <service>.<namespace>.svc.cluster.local).
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-900 question test?
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 Kubernetes Service (AKS) — Azure Kubernetes Service (AKS) is the correct choice because it provides a fully managed Kubernetes orchestration platform that handles automatic scaling (via Horizontal Pod Autoscaler), service discovery (via Kubernetes DNS and Services), and rolling updates (via Deployment strategies) without requiring you to manage the underlying virtual machines. AKS abstracts the control plane and node management, allowing you to focus on deploying and managing containerized microservices.
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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Last reviewed: Jun 11, 2026
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.
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