The correct answer is that the provider manages hardware and OS while customers manage their applications and data. This is the core definition of Platform as a Service (PaaS) within the cloud service model, where the cloud vendor handles the underlying infrastructure—including servers, storage, networking, operating systems, and middleware—so you can focus solely on deploying and managing your own applications and data without worrying about patching or hardware maintenance. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your ability to distinguish PaaS from IaaS and SaaS, often appearing as a scenario where you must identify which responsibility falls to the customer versus the provider. A common trap is confusing PaaS with IaaS, where the customer still manages the OS; remember that PaaS abstracts away the OS layer entirely. For a quick memory tip, think of PaaS as “Platform, not Patching”—you bring your code, the provider handles the rest.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 of the following best describes Platform as a Service (PaaS)?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The provider manages hardware and OS while customers manage their applications and data
Platform as a Service (PaaS) provides a managed hosting environment where the cloud provider handles the underlying infrastructure, including hardware, virtualization, operating system, and middleware. The customer is responsible only for deploying and managing their applications and data, making option B correct because it accurately describes this division of responsibility.
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.
✗
The customer manages everything including hardware and networking
Why it's wrong here
Managing hardware and networking describes on-premises infrastructure, not PaaS.
✓
The provider manages hardware and OS while customers manage their applications and data
Why this is correct
PaaS means the provider manages infrastructure and platform; customers focus on applications and data.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The customer accesses a complete application managed entirely by the provider
Why it's wrong here
A complete application managed by the provider describes SaaS, not PaaS.
✗
The provider manages physical servers while customers manage OS and applications
Why it's wrong here
Managing OS and applications on cloud servers describes IaaS, not PaaS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse PaaS with IaaS or SaaS, specifically mistaking the customer's responsibility for the OS (option D) or thinking PaaS means the provider manages the application (option C), when in fact PaaS gives the customer control over the application and data while the provider manages the OS and infrastructure.
Detailed technical explanation
How to think about this question
Under the hood, PaaS abstracts the runtime environment, often using containerization (e.g., Docker) or managed runtimes (e.g., Azure App Service) to isolate customer applications. The provider automatically handles OS patching, scaling, and load balancing, while the customer interacts only with the application deployment interface, such as FTP, Git, or REST APIs. A real-world scenario is deploying a web app on Azure App Service without needing to manage the underlying Windows or Linux VM, where the platform automatically applies security updates and scales out based on traffic.
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 cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The provider manages hardware and OS while customers manage their applications and data — Platform as a Service (PaaS) provides a managed hosting environment where the cloud provider handles the underlying infrastructure, including hardware, virtualization, operating system, and middleware. The customer is responsible only for deploying and managing their applications and data, making option B correct because it accurately describes this division of responsibility.
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.
Are there clue words in this question I should notice?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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