The answer is Azure Virtual Machines. This is the correct choice because Azure VMs provide full OS-level control, allowing you to install custom software, configure the kernel, and manage system-level settings for a custom Linux-based application, unlike platform-as-a-service (PaaS) offerings that abstract away the underlying infrastructure. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your ability to differentiate between Infrastructure-as-a-Service (IaaS) and PaaS compute services; a common trap is selecting Azure App Service or Azure Container Instances, which limit OS access. Remember the memory tip: "VM for the full system, PaaS for the app alone"—if you need to touch the kernel or install custom drivers, you need a Virtual Machine.
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.
A company wants to deploy a custom Linux-based application in Azure. They need full control over the operating system, including installing custom software and configuration. 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 Virtual Machines
Azure Virtual Machines (VMs) provide full control over the operating system, allowing you to install custom software, configure the kernel, and manage system-level settings. This is the correct choice for a custom Linux-based application that requires complete OS-level access, unlike platform-as-a-service offerings that abstract away the underlying infrastructure.
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 this is correct
VMs give you full control over the OS, allowing installation of custom software and configuration.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure App Service
Why it's wrong here
App Service abstracts the OS; you cannot install arbitrary software or have full control over the underlying OS.
✗
Azure Container Instances
Why it's wrong here
Containers share the host OS kernel and provide isolation but not full OS control; you manage only the container image.
✗
Azure Functions
Why it's wrong here
Azure Functions are serverless and execute code in response to events; they do not provide OS-level control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'full control over the OS' with container or serverless services, mistakenly thinking that Azure Container Instances or App Service provide similar flexibility, when in fact they abstract the OS layer entirely.
Detailed technical explanation
How to think about this question
Azure Virtual Machines use hypervisor-level isolation (Microsoft Hyper-V) to provide dedicated virtual hardware, including a full operating system instance. This allows you to SSH into the VM, modify /etc/ files, install packages via apt or yum, and even run custom kernel modules. In contrast, PaaS services like App Service run your code in a sandboxed environment with no direct OS access, making them unsuitable for scenarios requiring deep system customization.
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 (VMs) provide full control over the operating system, allowing you to install custom software, configure the kernel, and manage system-level settings. This is the correct choice for a custom Linux-based application that requires complete OS-level access, unlike platform-as-a-service offerings that abstract away the underlying infrastructure.
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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