- A
IaaS (Infrastructure as a Service)
Why wrong: With IaaS, the provider offers virtual machines but the customer is responsible for managing the OS, middleware, and runtime, which does not match the scenario.
- B
PaaS (Platform as a Service)
PaaS abstracts the underlying platform, so the provider handles the OS, runtime, and middleware, enabling developers to deploy applications without managing infrastructure.
- C
SaaS (Software as a Service)
Why wrong: SaaS delivers completed applications that users access over the internet; the provider manages everything, including the application, so developers do not write code to run on the platform.
- D
FaaS (Function as a Service)
Why wrong: FaaS is a serverless model where individual functions are executed in response to events, but the provider still manages the runtime environment, and it typically does not involve managing a persistent application runtime.
MS-900 Describe cloud concepts Practice Question
This MS-900 practice question tests your understanding of describe cloud concepts. 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 development team uses a cloud service to run applications where the provider manages the runtime environment, operating system, and middleware. The team only writes and uploads code. Which service model are they using?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
PaaS (Platform as a Service)
The scenario describes the team writing and uploading code while the provider manages the runtime environment, operating system, and middleware. This is the defining characteristic of Platform as a Service (PaaS), where the cloud provider abstracts the underlying infrastructure and platform layers, allowing developers to focus solely on application code. In PaaS, the provider handles OS patching, runtime updates, and middleware configuration, which matches the description exactly.
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.
- ✗
IaaS (Infrastructure as a Service)
Why it's wrong here
With IaaS, the provider offers virtual machines but the customer is responsible for managing the OS, middleware, and runtime, which does not match the scenario.
- ✓
PaaS (Platform as a Service)
Why this is correct
PaaS abstracts the underlying platform, so the provider handles the OS, runtime, and middleware, enabling developers to deploy applications without managing infrastructure.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
SaaS (Software as a Service)
Why it's wrong here
SaaS delivers completed applications that users access over the internet; the provider manages everything, including the application, so developers do not write code to run on the platform.
- ✗
FaaS (Function as a Service)
Why it's wrong here
FaaS is a serverless model where individual functions are executed in response to events, but the provider still manages the runtime environment, and it typically does not involve managing a persistent application runtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse PaaS with IaaS because both involve deploying applications, but the key differentiator is who manages the runtime and middleware — PaaS abstracts them away, while IaaS requires the user to manage them.
Trap categories for this question
Scenario analysis trap
With IaaS, the provider offers virtual machines but the customer is responsible for managing the OS, middleware, and runtime, which does not match the scenario.
Detailed technical explanation
How to think about this question
Under the hood, PaaS platforms like Azure App Service or AWS Elastic Beanstalk automatically provision and configure the underlying VMs, load balancers, and auto-scaling rules based on the application's needs, while exposing a deployment endpoint (e.g., via Git or FTP). The provider handles OS-level security patches, runtime updates (e.g., .NET CLR, Node.js), and middleware (e.g., IIS, Apache) through a shared responsibility model where the user only manages the application code and configuration. A real-world scenario is a team deploying a Django web app to Google App Engine: they upload Python code and dependencies, and App Engine automatically manages the web server (Gunicorn), SSL termination, and scaling without the team ever touching the OS.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this MS-900 question test?
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: PaaS (Platform as a Service) — The scenario describes the team writing and uploading code while the provider manages the runtime environment, operating system, and middleware. This is the defining characteristic of Platform as a Service (PaaS), where the cloud provider abstracts the underlying infrastructure and platform layers, allowing developers to focus solely on application code. In PaaS, the provider handles OS patching, runtime updates, and middleware configuration, which matches the description exactly.
What should I do if I get this MS-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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Last reviewed: Jun 11, 2026
This MS-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-900 exam.
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