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 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?
High availability
Why wrong: High availability refers to continuous uptime, not the payment model.
Scalability
Why wrong: Scalability is the ability to adjust resources, not the financial shift.
Operational expenditure (OpEx)
OpEx is the model where costs are variable and incurred based on usage, aligning with monthly fees.
Fault tolerance
Why wrong: Fault tolerance is about system resilience, not expenditure type.
Answer choices
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)
Option C is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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 refers to continuous uptime, not the payment model.
Scalability
Why it's wrong here
Scalability is the ability to adjust resources, not the financial shift.
Operational expenditure (OpEx)
Why this is correct
OpEx is the model where costs are variable and incurred based on usage, aligning with monthly fees.
Related concept
Read the scenario before looking for a memorised answer.
Fault tolerance
Why it's wrong here
Fault tolerance is about system resilience, not expenditure type.
Common exam traps
The trap here is that 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.
Detailed technical explanation
Under the hood, Azure’s OpEx model leverages metered billing via the Azure Resource Manager, where each resource (e.g., VM hours, storage GB-months, outbound data transfer) is tracked and billed monthly. This contrasts with on-premises CapEx, where depreciation schedules and fixed asset accounting apply. A real-world scenario: a startup can avoid a $50,000 server purchase and instead pay $500/month for a VM, scaling down during low usage to reduce costs, which is impossible with owned hardware.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Operational expenditure (OpEx) — Option C is correct because 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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