This MS-900 practice question tests your understanding of describe cloud concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 wants to use a cloud service where they can develop and run applications without managing the underlying infrastructure, including servers, operating systems, or storage. They only need to upload their code and the provider handles scaling and availability. Which cloud service model best describes this approach?
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
✓
Platform as a Service (PaaS)
Platform as a Service (PaaS) provides a managed hosting environment where developers can deploy applications without worrying about the underlying infrastructure. The provider automatically handles server provisioning, OS patching, storage management, and scaling based on demand. In this scenario, the company only needs to upload code, which is the defining characteristic of PaaS.
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
Incorrect. IaaS provides virtualized computing resources like VMs and storage, but the user manages the operating system and applications.
✓
Platform as a Service (PaaS)
Why this is correct
Correct. PaaS abstracts the infrastructure, allowing developers to focus on code while the provider handles scaling, patching, and availability.
Clue confirmation
The clue word "best" 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
Incorrect. SaaS delivers complete applications to end users, not a platform for custom application development.
✗
On-premises deployment
Why it's wrong here
Incorrect. On-premises is not a cloud model; it involves managing all hardware and software locally.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse PaaS with IaaS because both involve deploying applications, but IaaS requires manual OS and runtime management, whereas PaaS abstracts all infrastructure away.
Detailed technical explanation
How to think about this question
PaaS abstracts the runtime environment using containerization (e.g., Docker) or serverless functions (e.g., Azure Functions), automatically scaling instances via load balancers and health probes. A real-world example is deploying a Node.js app to Azure App Service: the developer uploads code via Git or FTP, and the platform handles IIS configuration, SSL termination, and auto-scaling based on CPU thresholds. Under the hood, PaaS relies on orchestration layers like Kubernetes or Service Fabric to manage resource allocation and fault tolerance.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-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: Platform as a Service (PaaS) — Platform as a Service (PaaS) provides a managed hosting environment where developers can deploy applications without worrying about the underlying infrastructure. The provider automatically handles server provisioning, OS patching, storage management, and scaling based on demand. In this scenario, the company only needs to upload code, which is the defining characteristic of PaaS.
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.
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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Question Discussion
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