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.
Which statement correctly describes the operational cost model of cloud computing?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
You pay for cloud resources only when you consume them, on a recurring basis
Option B is correct because cloud computing follows an operational expenditure (OpEx) model where you pay only for the resources you actually consume, such as compute hours, storage GB-months, or data transfer, on a recurring basis. This eliminates the need for large upfront capital investments and allows you to scale costs with usage, aligning with the pay-as-you-go pricing model central to Azure and other cloud providers.
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.
✗
You make large upfront investments in hardware that you own and depreciate
Why it's wrong here
Large upfront hardware investments describe the CapEx model of traditional on-premises IT.
✓
You pay for cloud resources only when you consume them, on a recurring basis
Why this is correct
Cloud is OpEx-based — you pay for consumed resources on a recurring basis with no upfront hardware costs.
Related concept
Read the scenario before looking for a memorised answer.
✗
You purchase cloud capacity in bulk at the beginning of each year
Why it's wrong here
Bulk upfront purchasing is not the primary cloud model; consumption-based billing is.
✗
You lease physical servers from the cloud provider for a fixed monthly fee
Why it's wrong here
Cloud abstracts physical servers; you consume logical compute resources, not lease specific hardware.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the operational cost model (pay-as-you-go) with cost-saving commitments like reserved instances or savings plans, which are separate pricing options that still operate within the broader consumption-based framework.
Detailed technical explanation
How to think about this question
Under the hood, Azure meters every resource usage at a granular level—for example, a virtual machine is billed per second of runtime (with a minimum of one minute), and storage is billed per GB per month based on actual data stored. This consumption-based model is enabled by hypervisor-level isolation and software-defined networking, allowing providers to aggregate usage across tenants and bill precisely. In a real-world scenario, a startup can spin up 100 VMs for a load test, pay only for the hours they run, and then delete them, avoiding any idle cost—something impossible with traditional hardware ownership.
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: You pay for cloud resources only when you consume them, on a recurring basis — Option B is correct because cloud computing follows an operational expenditure (OpEx) model where you pay only for the resources you actually consume, such as compute hours, storage GB-months, or data transfer, on a recurring basis. This eliminates the need for large upfront capital investments and allows you to scale costs with usage, aligning with the pay-as-you-go pricing model central to Azure and other cloud providers.
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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Question Discussion
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