The answer is a shift from Capital Expenditure (CapEx) to Operational Expenditure (OpEx). This is correct because the company previously made large upfront investments in physical servers every three years—a classic CapEx model—and has now moved to a monthly subscription for Azure virtual machines based on actual usage with no long-term commitment, which defines OpEx. On the Microsoft Azure Fundamentals AZ-900 exam, this concept tests your understanding of how cloud computing transforms financial models by converting fixed, upfront hardware costs into variable, consumption-based expenses. A common trap is confusing OpEx with simply paying monthly; the key distinction is that OpEx aligns cost directly with usage and requires no upfront capital. Remember the memory tip: CapEx is “buy it big and own it,” while OpEx is “pay as you go and grow.”
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 migrating its on-premises workloads to Azure. Previously, they purchased servers every three years as a large capital investment. Now, they pay a monthly subscription for virtual machines based on actual usage, with no long-term commitment. Which type of cloud expenditure model does this represent?
Capital expenditure (CapEx) to operational expenditure (OpEx)
Correct. The scenario shows a switch from upfront hardware purchase (CapEx) to pay-as-you-go subscription (OpEx).
B
Operational expenditure (OpEx) to capital expenditure (CapEx)
Why wrong: That would be the reverse, moving from subscription to buying hardware, which is not the case.
C
Pay-as-you-go to reserved
Why wrong: Reserved instances involve a commitment for a discount, but the scenario emphasizes the change from upfront purchase to usage-based payment.
D
Consumption-based to fixed cost
Why wrong: Fixed cost would be like reserved pricing, not the change described.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Capital expenditure (CapEx) to operational expenditure (OpEx)
This scenario describes a shift from Capital Expenditure (CapEx), where the company made large upfront investments in hardware every three years, to Operational Expenditure (OpEx), where they pay a monthly subscription for Azure virtual machines based on actual usage with no long-term commitment. This is a core benefit of cloud computing, converting fixed, upfront costs into variable, ongoing expenses that align with consumption.
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.
✓
Capital expenditure (CapEx) to operational expenditure (OpEx)
Why this is correct
Correct. The scenario shows a switch from upfront hardware purchase (CapEx) to pay-as-you-go subscription (OpEx).
Related concept
Read the scenario before looking for a memorised answer.
✗
Operational expenditure (OpEx) to capital expenditure (CapEx)
Why it's wrong here
That would be the reverse, moving from subscription to buying hardware, which is not the case.
✗
Pay-as-you-go to reserved
Why it's wrong here
Reserved instances involve a commitment for a discount, but the scenario emphasizes the change from upfront purchase to usage-based payment.
✗
Consumption-based to fixed cost
Why it's wrong here
Fixed cost would be like reserved pricing, not the change described.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the shift in expenditure model (CapEx to OpEx) with a change in Azure pricing tiers (e.g., pay-as-you-go vs. reserved instances), which is a separate concept about commitment levels, not the fundamental financial model of ownership versus consumption.
Trap categories for this question
Scenario analysis trap
Reserved instances involve a commitment for a discount, but the scenario emphasizes the change from upfront purchase to usage-based payment.
Detailed technical explanation
How to think about this question
Under the hood, CapEx involves depreciating physical assets over their useful life (e.g., three years for servers), impacting balance sheets and cash flow. OpEx, in contrast, is recorded as a periodic expense on the income statement, offering tax benefits and better cash flow predictability. In Azure, this shift is enabled by the hypervisor abstraction layer, which allows Microsoft to pool and dynamically allocate compute resources across tenants, making per-minute billing feasible without requiring customers to own hardware.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-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: Capital expenditure (CapEx) to operational expenditure (OpEx) — This scenario describes a shift from Capital Expenditure (CapEx), where the company made large upfront investments in hardware every three years, to Operational Expenditure (OpEx), where they pay a monthly subscription for Azure virtual machines based on actual usage with no long-term commitment. This is a core benefit of cloud computing, converting fixed, upfront costs into variable, ongoing expenses that align with consumption.
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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