This AZ-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 is moving from an on-premises data center to the cloud. Previously, they paid a large upfront sum for hardware and then annual maintenance fees. Now they pay a monthly subscription based on actual usage of compute and storage. This shift represents moving from which type of expenditure to which?
Why wrong: Going from OpEx to CapEx would mean paying upfront for assets, which is the opposite of what is described. The scenario describes moving from upfront costs to usage-based billing.
B
From CapEx to OpEx
The company is moving from capital expenditure (buying hardware) to operational expenditure (paying for usage). This is a common shift when adopting the cloud.
C
From variable to fixed costs
Why wrong: The scenario describes moving from a fixed upfront cost to a variable cost based on usage, not to fixed costs.
D
From direct to indirect costs
Why wrong: Direct vs indirect costs are accounting classifications not directly related to the shift from upfront hardware to usage-based billing.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
From CapEx to OpEx
Option B is correct because the scenario describes a shift from paying a large upfront sum for hardware (a capital expenditure, or CapEx) to a monthly subscription based on actual usage (an operational expenditure, or OpEx). In cloud computing, CapEx involves significant upfront costs for physical infrastructure, while OpEx involves ongoing, pay-as-you-go costs for services like compute and storage. This transition is a fundamental benefit of cloud adoption, allowing organizations to avoid large initial investments and instead pay for what they consume.
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.
✗
From OpEx to CapEx
Why it's wrong here
Going from OpEx to CapEx would mean paying upfront for assets, which is the opposite of what is described. The scenario describes moving from upfront costs to usage-based billing.
✓
From CapEx to OpEx
Why this is correct
The company is moving from capital expenditure (buying hardware) to operational expenditure (paying for usage). This is a common shift when adopting the cloud.
Related concept
Read the scenario before looking for a memorised answer.
✗
From variable to fixed costs
Why it's wrong here
The scenario describes moving from a fixed upfront cost to a variable cost based on usage, not to fixed costs.
✗
From direct to indirect costs
Why it's wrong here
Direct vs indirect costs are accounting classifications not directly related to the shift from upfront hardware to usage-based billing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the direction of the expenditure shift, mistakenly thinking that moving to the cloud increases upfront costs (OpEx to CapEx), when in reality it reduces them by converting capital expenses into operational expenses.
Trap categories for this question
Scenario analysis trap
Going from OpEx to CapEx would mean paying upfront for assets, which is the opposite of what is described. The scenario describes moving from upfront costs to usage-based billing.
Detailed technical explanation
How to think about this question
Under the hood, CapEx in on-premises data centers includes costs for servers, networking gear, and cooling, which are depreciated over time (e.g., 3-5 years). In contrast, OpEx in the cloud, such as Azure Virtual Machines or Azure Storage, is billed per second or per hour based on actual resource consumption, with no upfront commitment. This shift enables better cash flow management and scalability, as organizations can dynamically adjust resources without overprovisioning, a key principle of the consumption-based model.
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: From CapEx to OpEx — Option B is correct because the scenario describes a shift from paying a large upfront sum for hardware (a capital expenditure, or CapEx) to a monthly subscription based on actual usage (an operational expenditure, or OpEx). In cloud computing, CapEx involves significant upfront costs for physical infrastructure, while OpEx involves ongoing, pay-as-you-go costs for services like compute and storage. This transition is a fundamental benefit of cloud adoption, allowing organizations to avoid large initial investments and instead pay for what they consume.
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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