AZ-900 Describe cloud concepts Practice Question
A company pays a monthly subscription fee for cloud services based on the resources they consume, such as the number of virtual machines or amount of storage used. There are no upfront costs or fixed long-term commitments. This pricing model is known as:
⚠ Common exam trap
A common mix-up: candidates confuse 'pay-as-you-go' with 'reserved instances' because both involve monthly payments, but reserved instances require a fixed-term commitment (1 or 3 years) and upfront payment options, which the question explicitly excludes.
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 (also called consumption-based pricing) is the correct model because it charges the customer only for the actual resources consumed (e.g., VM hours, storage GBs) with no upfront payment or termination penalties. This aligns directly with the scenario of a monthly subscription fee based on resource usage without long-term commitments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Pay-as-you-go
Why this is correct
Pay-as-you-go is Azure's default consumption-based pricing model: you are billed only for the exact resources you consume each month, whether that is compute hours, storage capacities, or outbound data transfers. There are no upfront fees, minimum usage requirements, or long-term contracts, making it an operational expense and ideal for fluctuating or new workloads. A monthly subscription fee for cloud services naturally aligns with this model, as the invoice reflects actual usage rather than a fixed cost.
- ✗
Reserved instances
Why it's wrong here
Reserved Instances, now known as Azure Reserved Virtual Machine Instances, lock you into a one-year or three-year commitment in exchange for a significant discount on compute costs. You must pay for the entire term regardless of actual usage, which effectively turns the cost into a capital expense and assumes predictable, steady-state demand. This contradicts the scenario of a flexible monthly subscription fee, because commitment and prepayment replace pay-as-you-go flexibility.
When this WOULD be correct
A question describing a company that commits to a one-year term for a virtual machine in exchange for a lower hourly rate, with the option to pay upfront or monthly, would make Reserved instances the correct answer.
- ✗
Spot pricing
Why it's wrong here
Spot pricing applies specifically to Azure Spot Virtual Machines, where you purchase unused compute capacity at steeply reduced rates. However, these instances are preemptible — Azure can reclaim the capacity at any time with a short eviction notice, and you cannot rely on them for continuous, guaranteed uptime. This is not a standard monthly subscription fee; it is a supplemental, risk-tolerant option for interruptible batch jobs and stateless workloads.
When this WOULD be correct
A company runs fault-tolerant batch processing jobs that can be interrupted and resumed. They want to minimize costs by using spare cloud capacity. The pricing model that offers significant discounts for such flexible workloads is spot pricing.
- ✗
Hybrid benefit
Why it's wrong here
Azure Hybrid Benefit is a licensing cost-savings mechanism, not a billing plan: it lets you apply your existing Windows Server and SQL Server licenses with Software Assurance to Azure virtual machines, reducing the software license portion of your bill. It does not define how you pay for compute or storage, and it can actually be combined with pay-as-you-go or reserved capacity. Choosing it as the pricing model would be incorrect because it is an auxiliary discount, not a subscription-based payment scheme.
When this WOULD be correct
A question asking: 'A company wants to use their existing on-premises Windows Server licenses to reduce costs when migrating to Azure. Which benefit should they use?' would make Hybrid Benefit the correct answer.
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 Azure's default consumption-based pricing model: you are billed only for the exact resources you consume each month, whether that is compute hours, storage capacities, or outbound data transfers. There are no upfront fees, minimum usage requirements, or long-term contracts, making it an operational expense and ideal for fluctuating or new workloads. A monthly subscription fee for cloud services naturally aligns with this model, as the invoice reflects actual usage rather than a fixed cost.
✗Reserved instancesWrong answer — click to see why▾
Why this is wrong here
Reserved instances require a one- or three-year commitment and upfront payment, which contradicts the scenario's description of no upfront costs or long-term commitments.
★ When this WOULD be the correct answer
A question describing a company that commits to a one-year term for a virtual machine in exchange for a lower hourly rate, with the option to pay upfront or monthly, would make Reserved instances the correct answer.
Why candidates choose this
Candidates may confuse reserved instances with pay-as-you-go because both involve monthly payments, but reserved instances require a commitment period and often have lower rates, leading to a misunderstanding of the pricing model's flexibility.
✗Spot pricingWrong answer — click to see why▾
Why this is wrong here
Spot pricing involves bidding on unused cloud capacity with variable prices, not a fixed monthly subscription based on resource consumption. It does not guarantee availability and can be interrupted, unlike the described pay-as-you-go model.
★ When this WOULD be the correct answer
A company runs fault-tolerant batch processing jobs that can be interrupted and resumed. They want to minimize costs by using spare cloud capacity. The pricing model that offers significant discounts for such flexible workloads is spot pricing.
Why candidates choose this
Candidates may confuse spot pricing with pay-as-you-go because both involve paying for resources consumed, but spot pricing is specifically for interruptible workloads with dynamic pricing, not a simple monthly subscription.
✗Hybrid benefitWrong answer — click to see why▾
Why this is wrong here
The Hybrid Benefit is a licensing discount for using on-premises Windows Server or SQL Server licenses with Azure, not a pricing model based on resource consumption without upfront costs.
★ When this WOULD be the correct answer
A question asking: 'A company wants to use their existing on-premises Windows Server licenses to reduce costs when migrating to Azure. Which benefit should they use?' would make Hybrid Benefit the correct answer.
Why candidates choose this
Candidates may confuse 'Hybrid Benefit' with a flexible, consumption-based model because the term 'hybrid' suggests a mix of on-premises and cloud, but it specifically refers to license portability, not pricing.
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.