AZ-900 Describe Azure architecture and services Practice Question
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 Linux and Windows virtual machines in the cloud with full control over the operating system?
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) 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.
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 App Service
Why it's wrong here
App Service is PaaS — it hosts applications without exposing the underlying OS for direct management.
✓
Azure Virtual Machines
Why this is correct
Azure VMs provide IaaS with full OS control for both Windows and Linux, supporting any workload that needs OS-level customization.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Container Instances
Why it's wrong here
ACI runs containers — you don't manage an OS directly, just the containerized application.
✗
Azure Functions
Why it's wrong here
Functions are serverless — there's no OS to manage; just the function code.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse PaaS services like App Service or serverless Functions with IaaS VMs, mistakenly thinking they can control the OS in those services when in fact they only control the application code.
Detailed technical explanation
How to think about this question
Azure Virtual Machines use Hyper-V technology to provide hardware virtualization, allowing each VM to run its own kernel and OS independently. This enables scenarios like running legacy applications that require specific OS patches or custom drivers, or hosting a full Active Directory domain controller. The service supports both generation 1 and generation 2 VMs, with generation 2 offering UEFI boot and Secure Boot for enhanced security.
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
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.
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 Virtual Machines — 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.
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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Question Discussion
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