This MS-900 practice question tests your understanding of describe cloud concepts. 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. A key principle to apply: iaaS provides virtualized computing resources over the internet.. 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 service owner is comparing Microsoft 365 capabilities and needs to host custom applications on virtual machines while managing the operating system. Cloud concept or benefit best matches this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Platform as a Service (PaaS)
Why wrong: PaaS abstracts the operating system and runtime.
Infrastructure as a Service (IaaS)
IaaS provides virtual machines, storage, and networking while customers manage the operating system and applications.
Hybrid cloud
Why wrong: Hybrid cloud is a deployment model, not the service model described.
Software as a Service (SaaS)
Why wrong: SaaS is a finished application managed by the provider.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Infrastructure as a Service (IaaS)
Infrastructure as a Service (IaaS) provides virtualized computing resources over the internet, including virtual machines where the user manages the operating system and can host custom applications. This matches the requirement because the service owner needs full control over the OS and the ability to deploy custom applications without managing physical hardware.
Key principle: IaaS provides virtualized computing resources over the internet.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Platform as a Service (PaaS)
Why it's wrong here
PaaS abstracts the operating system and runtime.
Infrastructure as a Service (IaaS)
Hybrid cloud
Why it's wrong here
Hybrid cloud is a deployment model, not the service model described.
Software as a Service (SaaS)
Why it's wrong here
SaaS is a finished application managed by the provider.
Common exam traps
The trap here is that candidates often confuse PaaS with IaaS because both involve hosting applications, but PaaS removes OS management responsibility, which is explicitly required in the question.
Detailed technical explanation
In IaaS, the cloud provider offers virtual machines via hypervisors (e.g., Hyper-V, VMware ESXi) and the user is responsible for OS patches, security, and application configuration. For example, in Microsoft Azure, IaaS VMs use Azure Virtual Machines with the user managing the guest OS via RDP or SSH, while the provider handles physical hardware and network fabric. This contrasts with PaaS, where the provider automatically applies OS updates and scaling policies, limiting user control.
Key takeaway
IaaS provides virtualized computing resources over the internet.
Real-world example
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
Review iaaS provides virtualized computing resources over the internet., then practise related MS-900 questions on the same topic to reinforce the concept.
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FAQ
Describe cloud concepts — This question tests Describe cloud concepts — IaaS provides virtualized computing resources over the internet..
The correct answer is: Infrastructure as a Service (IaaS) — Infrastructure as a Service (IaaS) provides virtualized computing resources over the internet, including virtual machines where the user manages the operating system and can host custom applications. This matches the requirement because the service owner needs full control over the OS and the ability to deploy custom applications without managing physical hardware.
Review iaaS provides virtualized computing resources over the internet., then practise related MS-900 questions on the same topic to reinforce the concept.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
IaaS provides virtualized computing resources over the internet.
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Last reviewed: Jun 11, 2026
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