This MS-900 practice question tests your understanding of describe cloud concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
During requirements gathering, an IT manager says the organization must compare service models and identify where the customer manages the most layers. 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.
Software as a Service (SaaS)
Why wrong: SaaS is a finished application managed by the provider.
Infrastructure as a Service (IaaS)
Customers generally manage more layers in IaaS than in PaaS or SaaS.
Hybrid cloud
Why wrong: Hybrid cloud is a deployment model, not the service model described.
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)
The IT manager's requirement is to identify the service model where the customer manages the most layers. In Infrastructure as a Service (IaaS), the cloud provider manages only the physical infrastructure (servers, storage, networking), while the customer is responsible for managing the operating system, middleware, runtime, data, and applications. This gives the customer the highest degree of control and management responsibility compared to PaaS or SaaS.
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.
Software as a Service (SaaS)
Why it's wrong here
SaaS is a finished application managed by the provider.
Infrastructure as a Service (IaaS)
Hybrid cloud
Why it's wrong here
Hybrid cloud is a deployment model, not the service model described.
Common exam traps
The trap here is that candidates often confuse 'most management' with 'most convenience,' incorrectly selecting PaaS or SaaS because they assume more provider management is the goal, whereas the question explicitly asks for the model where the customer manages the most layers.
Detailed technical explanation
Under the shared responsibility model, IaaS aligns with the customer managing layers from the OS upward (e.g., patching the kernel, configuring firewalls, managing application stacks), while the provider handles the hypervisor, physical hardware, and network fabric. In a real-world scenario, a customer running a custom database on an IaaS VM must handle OS updates, database tuning, and backup scripts, whereas in PaaS (e.g., Azure SQL Database), the provider automates patching and high availability. This distinction is critical for compliance and operational overhead planning.
Key takeaway
IaaS provides virtualized computing resources over the internet.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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) — The IT manager's requirement is to identify the service model where the customer manages the most layers. In Infrastructure as a Service (IaaS), the cloud provider manages only the physical infrastructure (servers, storage, networking), while the customer is responsible for managing the operating system, middleware, runtime, data, and applications. This gives the customer the highest degree of control and management responsibility compared to PaaS or SaaS.
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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