Quick Answer
The answer is Azure Virtual Machines, the Infrastructure-as-a-Service (IaaS) compute offering that gives you full OS control for running both Windows and Linux virtual machines in Azure. This service is correct because it provides direct access to the guest operating system, allowing you to install custom software, manage updates, and configure networking exactly as you would on a physical server—unlike Platform-as-a-Service options like Azure App Service, which abstract away the OS. On the AZ-900 exam, this question tests your ability to distinguish IaaS from PaaS or serverless models; a common trap is confusing Azure Virtual Machines with Azure Container Instances, which run isolated applications without OS-level access. Remember the memory tip: “VM = Full Machine” — if you need to patch the OS or install a custom driver, you need a virtual machine, not a managed service.
This AZ-900 practice question tests your understanding of describe azure architecture and services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which Azure service allows you to run Windows or Linux virtual machines in Azure?
Azure App Service
Why wrong: App Service is PaaS for web apps; Virtual Machines provide IaaS with full OS control.
Azure Virtual Machines
Azure VMs provide IaaS compute for running Windows or Linux with full OS-level control.
Azure Container Instances
Why wrong: ACI runs containers; Virtual Machines run full OS instances.
Azure Functions
Why wrong: Functions is serverless code execution; VMs provide full virtual server environments.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Virtual Machines
Azure Virtual Machines (IaaS) provides full control over the guest operating system, allowing you to run both Windows and Linux VMs with custom configurations. Unlike PaaS or serverless services, VMs give you direct access to the OS for installing software, managing updates, and configuring networking.
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.
Azure App Service
Azure Virtual Machines
Why this is correct
Azure VMs provide IaaS compute for running Windows or Linux with full OS-level control.
Related concept
Read the scenario before looking for a memorised answer.
Azure Container Instances
Why it's wrong here
ACI runs containers; Virtual Machines run full OS instances.
Azure Functions
Why it's wrong here
Functions is serverless code execution; VMs provide full virtual server environments.
Common exam traps
The trap here is confusing PaaS services like App Service or serverless Functions with IaaS VMs, leading candidates to think they can run full OS-level workloads on services that only support code or containers.
Detailed technical explanation
Azure Virtual Machines use Hyper-V virtualization to provide isolated environments with dedicated vCPUs, memory, and disks. You can choose from a wide range of VM sizes (e.g., general-purpose D-series, memory-optimized E-series) and deploy custom images or marketplace images. Under the hood, each VM runs on a physical host managed by the Azure Fabric Controller, which handles live migration and patching without user intervention.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Virtual Machines — Azure Virtual Machines (IaaS) provides full control over the guest operating system, allowing you to run both Windows and Linux VMs with custom configurations. Unlike PaaS or serverless services, VMs give you direct access to the OS for installing software, managing updates, and configuring networking.
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.
About these practice questions
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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. Which Azure service allows you to run Linux and Windows virtual machines in the cloud with full control over the operating system?
easyWhy B: Azure Virtual Machines (IaaS) provide full control over the guest operating system, including the ability to install custom software, configure the kernel, and manage updates. This is the only service in the list that offers direct access to the OS for both Linux and Windows, as it runs on a hypervisor-managed virtual hardware stack.
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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