AZ-900 Describe cloud concepts Practice Question
A company is considering moving its on-premises workloads to Azure. The CFO wants to understand how Azure pricing works. Which pricing model allows them to pay only for what they use, with no upfront costs or termination fees?
⚠ Common exam trap
Watch out — candidates often confuse Spot VMs with pay-as-you-go because both have no upfront cost, but they overlook that Spot VMs can be evicted with short notice, which violates the 'no termination fees' requirement in a different way—by terminating the service itself, not charging a fee.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Pay-as-you-go
(Pay-as-you-go) is correct because it is the Azure pricing model that charges customers only for the resources they consume, with no upfront commitment or termination fees. This model provides maximum flexibility, allowing the company to scale usage up or down as needed without financial penalties, directly addressing the CFO's requirement for a usage-based cost structure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reserved instances
Why it's wrong here
Reserved instances are wrong because they require a prepaid or committed spend for a one- or three-year term, which is fundamentally incompatible with pay-as-you-go's flexibility. In exchange for this commitment, Azure offers a discounted price (up to ~72% off pay-as-you-go for VMs), but you are billed whether or not you use the reserved capacity. This model suits predictable, steady-state workloads, but a CFO wanting variable cost alignment and no termination fees would not use reservations as a default pricing model. The obligation and lack of elasticity are what separate it from pay-as-you-go.
When this WOULD be correct
A question that asks for a pricing model offering significant discounts in exchange for a long-term commitment (e.g., 'Which pricing model provides the highest discount for a predictable, steady-state workload over one or three years?') would make Reserved instances the correct answer.
- ✗
Spot VMs
Why it's wrong here
Spot VMs are wrong because they are not a consistent pay-as-you-go model: they offer deeply discounted compute but Azure can reclaim the capacity at any time for paying workloads, typically with a 30-second eviction warning. This makes them suitable only for interruptible, fault-tolerant batch jobs—not for general production workloads a CFO would typically migrate. The core issue is not the per-second metering, but the nontrivial risk of sudden termination, which violates the assumption of continuous availability that pay-as-you-go normally guarantees.
When this WOULD be correct
A question asking for the most cost-effective option for running fault-tolerant batch processing jobs or workloads that can handle interruptions, where the candidate must choose a pricing model that provides deep discounts in exchange for potential eviction.
- ✓
Pay-as-you-go
Why this is correct
Pay-as-you-go is the correct pricing model because Azure meters resources actually consumed—compute hours, storage, data transfer—and bills monthly with no upfront cost, no termination fee, and no long-term commitment. This gives a CFO full flexibility to scale usage up or down dynamically, converting on-premises capital expenditure into operational expenditure. Unlike spot or reserved options, pay-as-you-go is the standard default for all Azure services and provides predictable, consumption-based billing for any workload type.
- ✗
Hybrid Benefit
Why it's wrong here
Azure Hybrid Benefit is incorrect because it is a licensing-based cost-saving program, not a pricing model for resource consumption. It lets customers reuse existing Windows Server and SQL Server licenses with Software Assurance on Azure VMs, effectively lowering the hourly rate of those VMs. However, it does not change how Azure meters or bills resources—pay-as-you-go, reserved, and spot pricing all still apply underneath. Thus, choosing it as the pricing model is a category error; it is a discount overlay, not a billing modality.
When this WOULD be correct
A question asking: 'A company has existing Windows Server licenses with Software Assurance. Which Azure benefit allows them to reduce the cost of running Windows VMs in Azure?'
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓Pay-as-you-goCorrect answer▾
Why this is correct
Pay-as-you-go is the correct pricing model because Azure meters resources actually consumed—compute hours, storage, data transfer—and bills monthly with no upfront cost, no termination fee, and no long-term commitment. This gives a CFO full flexibility to scale usage up or down dynamically, converting on-premises capital expenditure into operational expenditure. Unlike spot or reserved options, pay-as-you-go is the standard default for all Azure services and provides predictable, consumption-based billing for any workload type.
✗Reserved instancesWrong answer — click to see why▾
Why this is wrong here
Reserved instances require a 1- or 3-year commitment with upfront or monthly payments, not a pay-only-for-what-you-use model with no upfront costs or termination fees.
★ When this WOULD be the correct answer
A question that asks for a pricing model offering significant discounts in exchange for a long-term commitment (e.g., 'Which pricing model provides the highest discount for a predictable, steady-state workload over one or three years?') would make Reserved instances the correct answer.
Why candidates choose this
Candidates may confuse 'reserved' with 'pay-as-you-go' because both can reduce costs, but they overlook the commitment and upfront payment requirements of Reserved instances.
✗Spot VMsWrong answer — click to see why▾
Why this is wrong here
Spot VMs offer significant discounts but can be terminated by Azure when capacity is needed, and they do not guarantee no upfront costs or termination fees; they are not a pure pay-per-use model without termination risk.
★ When this WOULD be the correct answer
A question asking for the most cost-effective option for running fault-tolerant batch processing jobs or workloads that can handle interruptions, where the candidate must choose a pricing model that provides deep discounts in exchange for potential eviction.
Why candidates choose this
Candidates may think Spot VMs are pay-per-use because they are billed per second, but overlook the termination risk and the fact that they are not the standard 'pay only for what you use' model without upfront costs or termination fees.
✗Hybrid BenefitWrong answer — click to see why▾
Why this is wrong here
Azure Hybrid Benefit is a licensing discount for using existing Windows Server or SQL Server licenses with Azure, not a pricing model. It does not define how you pay for compute resources (e.g., pay-as-you-go vs. reserved).
★ When this WOULD be the correct answer
A question asking: 'A company has existing Windows Server licenses with Software Assurance. Which Azure benefit allows them to reduce the cost of running Windows VMs in Azure?'
Why candidates choose this
Candidates may confuse 'benefit' with 'pricing model' and think Hybrid Benefit offers flexible, usage-based billing, but it is actually a cost-saving add-on for license portability.
Analysis generated from the official AZ-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.