- A
Infrastructure as a Service (IaaS)
Why wrong: IaaS provides virtual machines, storage, and networking. The customer is responsible for managing the operating system, runtime, and middleware, which contradicts the requirement to avoid that overhead.
- B
Platform as a Service (PaaS)
PaaS abstracts the underlying infrastructure, including the OS and runtime, so the team can focus on application code and data. Azure App Service is a common PaaS offering for web applications.
- C
Software as a Service (SaaS)
Why wrong: SaaS delivers complete, ready-to-use applications accessed over the internet. The customer cannot write custom application code or manage their own data in the same way as with a platform.
- D
Functions as a Service (FaaS)
Why wrong: FaaS (e.g., Azure Functions) is serverless and event-driven. While it reduces infrastructure management, it is optimized for individual functions or microservices, not for hosting a full custom web application with persistent code and data management. PaaS is the appropriate model for this scenario.
Quick Answer
The answer is Platform as a Service (PaaS). This is the correct choice because PaaS abstracts the underlying operating system, runtime, and middleware, allowing developers to focus exclusively on writing application code and managing data while Azure handles patching, load balancing, and scaling. In contrast, IaaS would require the team to manage virtual machines, OS updates, and runtime configurations, which contradicts the goal of minimizing operational overhead. On the Microsoft Azure Fundamentals AZ-900 exam, this distinction frequently appears in scenario-based questions where you must choose between PaaS and IaaS based on responsibility boundaries. A common trap is selecting IaaS when the question emphasizes “no OS management,” but remember that PaaS removes all infrastructure layers except the application and data. For a quick memory tip: think “PaaS = Platform, no OS hassle; IaaS = Infrastructure, you manage the stack.”
AZ-900 Describe cloud concepts Practice Question
This AZ-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. 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 company is developing a custom web application that will be deployed to Azure. The development team wants to minimize operational overhead and avoid any responsibility for managing the underlying operating system, runtime, or middleware. They want to focus solely on writing application code and managing data. Which cloud service model should the company use for this application?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Platform as a Service (PaaS)
Platform as a Service (PaaS) is the correct model because it abstracts the underlying OS, runtime, and middleware, allowing developers to focus solely on writing application code and managing data. Azure App Service is a PaaS offering that provides automatic patching, load balancing, and scaling without any responsibility for the host OS or runtime environment. This directly matches the requirement to minimize operational overhead and avoid managing infrastructure layers.
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.
- ✗
Infrastructure as a Service (IaaS)
Why it's wrong here
IaaS provides virtual machines, storage, and networking. The customer is responsible for managing the operating system, runtime, and middleware, which contradicts the requirement to avoid that overhead.
- ✓
Platform as a Service (PaaS)
Why this is correct
PaaS abstracts the underlying infrastructure, including the OS and runtime, so the team can focus on application code and data. Azure App Service is a common PaaS offering for web applications.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Software as a Service (SaaS)
Why it's wrong here
SaaS delivers complete, ready-to-use applications accessed over the internet. The customer cannot write custom application code or manage their own data in the same way as with a platform.
- ✗
Functions as a Service (FaaS)
Why it's wrong here
FaaS (e.g., Azure Functions) is serverless and event-driven. While it reduces infrastructure management, it is optimized for individual functions or microservices, not for hosting a full custom web application with persistent code and data management. PaaS is the appropriate model for this scenario.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse PaaS with IaaS because they think 'custom application' requires full control over the OS, but the question explicitly states the team wants to avoid managing the OS, runtime, or middleware, which is the defining characteristic of PaaS.
Trap categories for this question
Scenario analysis trap
FaaS (e.g., Azure Functions) is serverless and event-driven. While it reduces infrastructure management, it is optimized for individual functions or microservices, not for hosting a full custom web application with persistent code and data management. PaaS is the appropriate model for this scenario.
Detailed technical explanation
How to think about this question
Under the hood, PaaS platforms like Azure App Service use a sandboxed worker process (w3wp.exe for .NET) that runs on a managed VM fleet, with automatic OS patching via the Azure Guest OS update process. The platform handles TLS termination, HTTP request routing, and health probes, while the developer only deploys code via Git, FTP, or CI/CD pipelines. A real-world scenario is deploying a Django web app on Azure App Service: the developer writes Python code and configures a PostgreSQL database via Azure Database for PostgreSQL (also PaaS), without ever touching the underlying Linux VM or Nginx server.
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 AZ-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: Platform as a Service (PaaS) — Platform as a Service (PaaS) is the correct model because it abstracts the underlying OS, runtime, and middleware, allowing developers to focus solely on writing application code and managing data. Azure App Service is a PaaS offering that provides automatic patching, load balancing, and scaling without any responsibility for the host OS or runtime environment. This directly matches the requirement to minimize operational overhead and avoid managing infrastructure layers.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 AZ-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 AZ-900 exam.
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