AZ-900 Describe cloud concepts Practice Question
A healthcare company is planning to migrate its on-premises data center to Azure. The CFO wants to shift from making large upfront hardware purchases to paying for IT resources as an ongoing operational cost. Which cloud computing benefit does this scenario describe?
⚠ Common exam trap
Many exam-takers confuse operational expenditure (OpEx) with elasticity or high availability, but the question specifically focuses on the financial shift from upfront hardware purchases to ongoing operational costs, not on scaling or reliability features.
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
✓
Operational expenditure (OpEx)
The scenario describes shifting from capital expenditure (CapEx) for upfront hardware purchases to operational expenditure (OpEx) for ongoing, pay-as-you-go IT resource consumption. This is a core financial benefit of cloud computing, where costs are treated as variable operating expenses rather than fixed capital investments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
High availability
Why it's wrong here
High availability is incorrect here because it addresses system uptime and resilience, ensuring that applications remain accessible during failures (e.g., via redundant infrastructure or availability zones). It does not describe the financial mechanism of paying for resources as an ongoing cost; rather, high availability is an architectural benefit that may even require additional spending for redundancy, not a shift from capital to operational expenditure.
When this WOULD be correct
A company requires its critical applications to be accessible 99.99% of the time, with redundant infrastructure across multiple Azure regions to minimize downtime. In that scenario, high availability would be the correct answer.
- ✗
Elasticity
Why it's wrong here
Elasticity is incorrect because it refers to the ability to automatically scale computing resources — such as VMs or app services — up or down based on demand, matching capacity to real-time workload fluctuations. While elasticity can indirectly reduce costs by avoiding overprovisioning, it does not directly explain the CFO's goal of replacing large upfront purchases with an ongoing, pay-as-you-go financial model; it is a dynamic scaling characteristic, not a cost-structure principle.
When this WOULD be correct
A question that asks: 'A startup expects unpredictable traffic spikes. Which cloud benefit allows them to automatically add virtual machines during high demand and remove them when demand drops?' — Elasticity would be the correct answer.
- ✓
Operational expenditure (OpEx)
Why this is correct
Operational expenditure (OpEx) is the correct answer because moving from on-premises capital-intensive purchases (servers, storage, software licenses) to a cloud subscription model converts those upfront capital expenses into recurring, variable operational costs. The CFO's concern about avoiding a large initial budget hit maps directly to OpEx, where organizations pay monthly or per-use for IT resources, improving cash-flow predictability and shifting financial risk to the cloud provider.
- ✗
Fault tolerance
Why it's wrong here
Fault tolerance is incorrect because it is a design property that lets a system continue operating correctly even when one or more components (e.g., servers, network links) fail, often through redundant components and automatic failover. This is fundamentally about reliability and business continuity, not about how costs are categorized or paid; it neither defines the operational expenditure model nor addresses the CFO's concern about avoiding large capital outlays.
When this WOULD be correct
A question like 'A company needs to ensure its application remains available even if an Azure datacenter fails. Which benefit does this describe?' would make fault tolerance the correct answer, as it focuses on resilience against failures.
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.
✓Operational expenditure (OpEx)Correct answer▾
Why this is correct
Operational expenditure (OpEx) is the correct answer because moving from on-premises capital-intensive purchases (servers, storage, software licenses) to a cloud subscription model converts those upfront capital expenses into recurring, variable operational costs. The CFO's concern about avoiding a large initial budget hit maps directly to OpEx, where organizations pay monthly or per-use for IT resources, improving cash-flow predictability and shifting financial risk to the cloud provider.
✗High availabilityWrong answer — click to see why▾
Why this is wrong here
High availability refers to ensuring services remain operational with minimal downtime, not to the financial shift from capital to operational expenses. The question specifically asks about paying for IT resources as an ongoing cost, which is OpEx.
★ When this WOULD be the correct answer
A company requires its critical applications to be accessible 99.99% of the time, with redundant infrastructure across multiple Azure regions to minimize downtime. In that scenario, high availability would be the correct answer.
Why candidates choose this
Candidates may confuse the benefit of not paying for idle capacity (which relates to OpEx) with the benefit of always-on services, mistakenly thinking high availability implies cost savings from not overprovisioning.
✗ElasticityWrong answer — click to see why▾
Why this is wrong here
Elasticity refers to the ability to scale resources up or down based on demand, not to the shift from capital expenditure to operational expenditure. The CFO's concern is about changing the cost model, not about dynamic scaling.
★ When this WOULD be the correct answer
A question that asks: 'A startup expects unpredictable traffic spikes. Which cloud benefit allows them to automatically add virtual machines during high demand and remove them when demand drops?' — Elasticity would be the correct answer.
Why candidates choose this
Candidates may confuse the pay-as-you-go model (OpEx) with the ability to scale resources (elasticity), as both involve paying only for what you use, but elasticity specifically addresses scaling capabilities.
✗Fault toleranceWrong answer — click to see why▾
Why this is wrong here
Fault tolerance refers to a system's ability to continue operating despite component failures, not to the shift from capital expenditure to operational expenditure. The question specifically asks about paying for IT resources as an ongoing cost, which is OpEx.
★ When this WOULD be the correct answer
A question like 'A company needs to ensure its application remains available even if an Azure datacenter fails. Which benefit does this describe?' would make fault tolerance the correct answer, as it focuses on resilience against failures.
Why candidates choose this
Candidates may confuse fault tolerance with the general reliability of cloud services, or mistakenly think that avoiding upfront hardware costs implies built-in redundancy, but fault tolerance is about system resilience, not cost model.
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?”
Go deeper
Related to this question
Learn chapter
What is Cloud Computing?
Key term
Cloud computing
Cloud computing is the on-demand delivery of IT resources over the internet, allowing users to access computing power, storage, and applications without owning physical hardware.
Key term
OpEx
Operational Expenditure (OpEx) is the ongoing cost for running a business, like paying for cloud services monthly instead of buying hardware upfront.
About these practice questions
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JA
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.