The correct answer is B) Pay-as-you-go, because this cloud pricing model is specifically designed to align costs directly with actual consumption, requiring no upfront payments or long-term commitments. Technically, pay-as-you-go operates on a consumption-based model where you are billed only for the compute resources you use, such as virtual machine hours or storage, and you can freely scale resources up or down in real time to match demand. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of core pricing concepts, often contrasting pay-as-you-go with reserved instances or spot pricing; a common trap is confusing it with a free tier or flat-rate plan. Remember that pay-as-you-go is the default, flexible option for variable workloads, while reserved instances offer discounts for commitment. A helpful memory tip: think of it like a utility bill—you pay for exactly what you use, no more, no less.
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 wants to pay only for the compute resources they actually use, with no upfront costs. They can scale up or down based on demand. Which cloud pricing model does this describe?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
B) Pay-as-you-go
The pay-as-you-go model (also called consumption-based pricing) allows a company to pay only for the compute resources they actually consume, with no upfront costs or long-term commitments. This model provides the flexibility to scale resources up or down based on real-time demand, aligning costs directly with usage. It is the standard pricing model for most cloud services, including Azure virtual machines and App Service plans, when no reservation or spot discount is applied.
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.
✗
A) Reserved capacity
Why it's wrong here
Reserved capacity requires a one- or three-year commitment for a discount, not pay-per-use without upfront costs.
✓
B) Pay-as-you-go
Why this is correct
Pay-as-you-go charges based on actual usage with no upfront payment, offering flexibility to scale.
Related concept
Read the scenario before looking for a memorised answer.
✗
C) Spot pricing
Why it's wrong here
Spot pricing offers discounted capacity but instances can be evicted; not a guaranteed per-usage model.
✗
D) Hybrid benefit
Why it's wrong here
Hybrid benefit reduces cost by using on-premises licenses, not a pricing model for pay-per-use.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the distinction between pay-as-you-go and reserved capacity, where candidates mistakenly think reserved capacity also allows scaling without upfront costs, but reserved capacity requires a commitment and does not offer the same on-demand flexibility.
Detailed technical explanation
How to think about this question
Under the hood, pay-as-you-go billing in Azure is metered per second for virtual machines and per execution for serverless services like Azure Functions, with charges appearing on the monthly invoice based on resource consumption. A subtle behavior is that even when a VM is stopped (deallocated), you are not charged for compute but still incur storage costs for the OS disk and any attached data disks. In a real-world scenario, a startup with unpredictable traffic might use pay-as-you-go to avoid overprovisioning, then later move to reserved instances once usage patterns stabilize to save up to 72%.
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: B) Pay-as-you-go — The pay-as-you-go model (also called consumption-based pricing) allows a company to pay only for the compute resources they actually consume, with no upfront costs or long-term commitments. This model provides the flexibility to scale resources up or down based on real-time demand, aligning costs directly with usage. It is the standard pricing model for most cloud services, including Azure virtual machines and App Service plans, when no reservation or spot discount is applied.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which of the following is a key advantage of the public cloud model for a startup company with limited capital?
medium
A.Complete control over all hardware configurations
✓ B.No upfront capital investment — pay only for resources used
C.Guaranteed highest possible performance at all times
D.Exclusive use of physical hardware not shared with others
Why B: For a startup with limited capital, the public cloud model eliminates the need for large upfront hardware purchases. Instead, it uses a consumption-based pricing model where you pay only for the compute, storage, and network resources you actually use, typically billed per second or per hour. This operational expenditure (OpEx) model directly addresses the capital expenditure (CapEx) constraints of a new company.
Last reviewed: Jun 30, 2026
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