- A
Elasticity
Why wrong: Incorrect. Elasticity is the ability to automatically provision and de-provision resources to match demand. While it can impact cost, it does not directly describe the shift from CapEx to OpEx.
- B
High availability
Why wrong: Incorrect. High availability refers to ensuring applications remain operational despite component failures (e.g., via redundancy across multiple servers or data centers). It does not address the financial model of paying for resources.
- C
Predictable performance
Why wrong: Incorrect. Predictable performance means that resources deliver consistent throughput and latency, often guaranteed by service-level agreements. It is not related to the financial shift from CapEx to OpEx.
- D
Consumption-based pricing (OpEx model)
Correct. Cloud computing enables a consumption-based (pay-as-you-go) pricing model, where organizations pay only for the resources they use on a recurring basis (OpEx) instead of making large upfront purchases (CapEx). This is a fundamental financial benefit of cloud adoption.
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 currently runs its IT operations entirely on-premises. The finance team is evaluating moving to Azure and wants to understand the financial impact. They currently purchase new servers every five years as a large upfront capital expenditure (CapEx). In Azure, they would pay a fixed monthly subscription for virtual machines instead. This shift from a large upfront payment to a smaller monthly operational expense (OpEx) is a direct illustration of which cloud computing benefit?
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
Consumption-based pricing (OpEx model)
Option D is correct because the shift from a large upfront capital expenditure (CapEx) for on-premises servers to a fixed monthly operational expense (OpEx) for Azure virtual machines directly illustrates the consumption-based pricing model. This model allows organizations to pay only for the resources they use, converting large, infrequent costs into predictable, smaller monthly payments. It is a fundamental cloud benefit that aligns with the OpEx financial model, enabling better cash flow management and budget forecasting.
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.
- ✗
Elasticity
Why it's wrong here
Incorrect. Elasticity is the ability to automatically provision and de-provision resources to match demand. While it can impact cost, it does not directly describe the shift from CapEx to OpEx.
- ✗
High availability
Why it's wrong here
Incorrect. High availability refers to ensuring applications remain operational despite component failures (e.g., via redundancy across multiple servers or data centers). It does not address the financial model of paying for resources.
- ✗
Predictable performance
Why it's wrong here
Incorrect. Predictable performance means that resources deliver consistent throughput and latency, often guaranteed by service-level agreements. It is not related to the financial shift from CapEx to OpEx.
- ✓
Consumption-based pricing (OpEx model)
Why this is correct
Correct. Cloud computing enables a consumption-based (pay-as-you-go) pricing model, where organizations pay only for the resources they use on a recurring basis (OpEx) instead of making large upfront purchases (CapEx). This is a fundamental financial benefit of cloud adoption.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'consumption-based pricing' with 'elasticity' because both involve scaling, but elasticity is about resource adjustment, not the financial model of paying per use.
Detailed technical explanation
How to think about this question
Under the hood, Azure's consumption-based pricing is implemented through per-second billing for virtual machines, meaning you are charged only for the compute time consumed, with no upfront commitment unless you choose reserved instances. This model leverages Azure's metering infrastructure, which tracks resource usage via Azure Monitor and the billing API, enabling granular cost allocation. In a real-world scenario, a company migrating from a five-year server refresh cycle to Azure VMs can use Azure Cost Management to analyze spending patterns and optimize costs by right-sizing instances or using spot VMs for non-critical workloads.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
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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: Consumption-based pricing (OpEx model) — Option D is correct because the shift from a large upfront capital expenditure (CapEx) for on-premises servers to a fixed monthly operational expense (OpEx) for Azure virtual machines directly illustrates the consumption-based pricing model. This model allows organizations to pay only for the resources they use, converting large, infrequent costs into predictable, smaller monthly payments. It is a fundamental cloud benefit that aligns with the OpEx financial model, enabling better cash flow management and budget forecasting.
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.
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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