AZ-900 Question #504: Real Exam Question with Answer & Explanation

Question

To which type of cloud service can you install an operating system?

Options

• Ainfrastructure as a service (IaaS) only
• Bplatform as a service (PaaS) only
• Csoftware as a service (SaaS) only
• Dinfrastructure as a service (IaaS) and platform as a service (PaaS) only
• Eplatform as a service (PaaS) and software as a service (SaaS) only

Explanation

Only Infrastructure as a Service (IaaS) grants customers the control to install and manage the operating system.

Common mistakes.

• B. Platform as a Service (PaaS) abstracts the operating system, which is managed by the cloud provider, so customers cannot install their own.
• C. Software as a Service (SaaS) provides ready-to-use applications where the entire stack, including the operating system, is managed by the provider, offering no OS installation capability to the user.
• D. PaaS does not allow OS installation, making this choice incorrect.
• E. Neither PaaS nor SaaS allows OS installation, making this choice incorrect.

Concept tested. Cloud service models (IaaS OS control)

Reference. https://learn.microsoft.com/en-us/azure/cloud-adoption-framework/strategy/cloud-overview#cloud-service-models

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