AZ-900 Describe cloud concepts Practice Question
A company wants to move from an on-premises data center to Azure. They currently budget for purchasing servers, networking equipment, and software licenses as a one-time capital expense. In Azure, they will pay a monthly fee based on the resources they use. What type of cloud benefit does this represent?
⚠ Common exam trap
A common mix-up: candidates confuse the financial benefit (OpEx) with operational benefits like high availability or scalability, because all three are cloud advantages, but only OpEx directly addresses the shift from upfront capital spending to ongoing usage-based payments.
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
✓
Operational expenditure (OpEx)
Moving from a capital expense (CapEx) model—where servers, networking gear, and licenses are purchased upfront—to a pay-as-you-go monthly fee in Azure represents a shift to operational expenditure (OpEx). This cloud benefit allows the company to avoid large upfront investments and instead pay for only the compute, storage, and network resources consumed, aligning costs with usage.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
High availability
Why it's wrong here
High availability is the design principle of ensuring that workloads remain accessible and running during failures, often by using redundancy across availability zones or regions. While moving to Azure does enable high availability, it is a technical reliability characteristic, not a cost accounting model. The question specifically asks about the change in expenditure type, so high availability does not answer it.
When this WOULD be correct
A question asks: 'A company deploys a web app across multiple Azure regions to ensure it remains accessible even if one region fails. What benefit does this provide?' High availability would be correct as it describes maintaining service uptime despite failures.
- ✗
Scalability
Why it's wrong here
Scalability is the capability to increase or decrease resources in response to demand, either by scaling up to larger instances or scaling out to more instances. Although Azure offers flexible scaling that can help optimize costs, scaling is a technical operational benefit, not a way of categorizing expenses. The financial shift from upfront capital investment to variable usage-based fees is specifically the OpEx model, not scalability.
When this WOULD be correct
A company expects variable demand for its application and wants to automatically adjust resources to handle traffic spikes without manual intervention. The correct answer would be scalability, as it describes the cloud's ability to elastically provision resources.
- ✓
Operational expenditure (OpEx)
Why this is correct
Moving from on-premises data centers to Azure represents a shift from capital expenditure (CapEx) to operational expenditure (OpEx) because Azure uses a consumption-based pricing model. You pay monthly for only the compute, storage, and network resources you actually use, with no upfront hardware purchases. This aligns with OpEx, where costs are variable and directly tied to usage, making it the correct financial classification for this transition.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance refers to a system's ability to continue operating without interruption when one or more components fail, relying on redundant components and automatic failover. This is a resilience attribute of cloud architectures, not a financial or operational expenditure category. The shift to Azure from on-premises is about how costs are classified and paid, making fault tolerance irrelevant to the question.
When this WOULD be correct
A question asks: 'A company deploys a critical application on Azure across multiple availability zones. Even if one zone fails, the application remains accessible. What cloud benefit does this represent?' In that context, fault tolerance would be the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓Operational expenditure (OpEx)Correct answer▾
Why this is correct
Moving from on-premises data centers to Azure represents a shift from capital expenditure (CapEx) to operational expenditure (OpEx) because Azure uses a consumption-based pricing model. You pay monthly for only the compute, storage, and network resources you actually use, with no upfront hardware purchases. This aligns with OpEx, where costs are variable and directly tied to usage, making it the correct financial classification for this transition.
✗High availabilityWrong answer — click to see why▾
Why this is wrong here
High availability refers to ensuring services remain operational with minimal downtime, not to the shift from capital to operational spending. The question focuses on the change in expense model, not system uptime.
★ When this WOULD be the correct answer
A question asks: 'A company deploys a web app across multiple Azure regions to ensure it remains accessible even if one region fails. What benefit does this provide?' High availability would be correct as it describes maintaining service uptime despite failures.
Why candidates choose this
Candidates may confuse the financial benefit of OpEx with operational benefits like high availability, thinking that moving to the cloud inherently improves uptime, but the question specifically contrasts capital vs. operational expenditure.
✗ScalabilityWrong answer — click to see why▾
Why this is wrong here
Scalability refers to the ability to increase or decrease resources as demand changes, not to the shift from capital to operational spending. The question specifically asks about the financial benefit of moving from upfront capital expense to a pay-as-you-go model.
★ When this WOULD be the correct answer
A company expects variable demand for its application and wants to automatically adjust resources to handle traffic spikes without manual intervention. The correct answer would be scalability, as it describes the cloud's ability to elastically provision resources.
Why candidates choose this
Candidates may confuse the financial flexibility of OpEx with the operational flexibility of scaling resources, as both are key cloud benefits often discussed together.
✗Fault toleranceWrong answer — click to see why▾
Why this is wrong here
Fault tolerance refers to a system's ability to continue operating despite component failures, not to the shift from capital expense to pay-as-you-go pricing. The question is about financial benefits of cloud consumption, not system resilience.
★ When this WOULD be the correct answer
A question asks: 'A company deploys a critical application on Azure across multiple availability zones. Even if one zone fails, the application remains accessible. What cloud benefit does this represent?' In that context, fault tolerance would be the correct answer.
Why candidates choose this
Candidates may confuse fault tolerance with the general reliability benefits of the cloud, or mistakenly think that moving from CapEx to OpEx inherently improves fault tolerance.
Analysis generated from the official AZ-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
What is Cloud Computing?
Key term
OpEx
Operational Expenditure (OpEx) is the ongoing cost for running a business, like paying for cloud services monthly instead of buying hardware upfront.
Key term
CapEx
CapEx (Capital Expenditure) is the money a company spends upfront to buy, build, or improve physical assets like servers, buildings, or equipment, which are then owned and depreciated over time.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.