Question 987 of 1,031

Describe cloud concepts →mediumMultiple ChoiceObjective-mapped

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.

Question 1mediummultiple choice

Full question →

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.

Full breakdown with real-world context →

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.

Related AZ-900 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Describe cloud concepts practice questions

Practise AZ-900 questions linked to Describe cloud concepts.

Describe Azure architecture and services practice questions

Practise AZ-900 questions linked to Describe Azure architecture and services.

Describe Azure management and governance practice questions

Practise AZ-900 questions linked to Describe Azure management and governance.

AZ-900 Azure services practice questions

Practise AZ-900 questions linked to AZ-900 Azure services.

AZ-900 pricing and support practice questions

Practise AZ-900 questions linked to AZ-900 pricing and support.

AZ-900 security and compliance practice questions

Practise AZ-900 questions linked to AZ-900 security and compliance.

AZ-900 governance practice questions

Practise AZ-900 questions linked to AZ-900 governance.

Practice this exam

Start a free AZ-900 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

AZ-900 practice-test guide →Study guide →Browse all practice tests

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.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

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.