AZ-900 Describe cloud concepts Practice Question
Which statement correctly describes the operational cost model of cloud computing?
⚠ Common exam trap
It's easy for candidates to 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.
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
✓
You pay for cloud resources only when you consume them, on a recurring basis
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.
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 purchases followed by depreciation over several years describe the capital expenditure (CapEx) model of traditional on-premises IT. In cloud computing, the provider owns the physical infrastructure and customers shift to operating expenditure (OpEx), paying for resources as they are used. Since there is no hardware asset to own or depreciate, this option does not represent cloud's consumption-based pricing model.
- ✓
You pay for cloud resources only when you consume them, on a recurring basis
Why this is correct
Consumption-based pricing is the defining financial model of cloud computing: you are billed for metered usage such as VM-hours, storage GB-months, or outbound data transfer, typically on a recurring monthly cycle. Costs accrue only when resources are actively in use or data resides in the cloud, and you can deallocate resources to stop paying entirely. This shifts IT spend from capital expenditure (CapEx) to operating expenditure (OpEx), with no upfront hardware investment and the flexibility to align costs directly with actual demand.
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You purchase cloud capacity in bulk at the beginning of each year
Why it's wrong here
Cloud billing is fundamentally usage-based: you pay only for what you consume (compute-hours, storage GBs, network egress) without committing to a fixed capacity. Providers like AWS/GCP/Azure offer savings plans or reserved capacity as optional discount mechanisms, but those involve prepaying or committing to a specific usage level, not purchasing capacity in bulk upfront. The consumption-based model is the default and core principle; bulk annual purchases are a financial optimization, not the primary billing structure.
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You lease physical servers from the cloud provider for a fixed monthly fee
Why it's wrong here
Cloud providers abstract away physical hardware entirely; you consume logical compute resources such as virtual machines, containers, or serverless functions running on shared infrastructure. You never lease a specific physical server for a fixed monthly fee because capacity is elastic and metered per second/minute, not tied to a hardware asset. A fixed monthly lease of dedicated physical hardware describes managed hosting or colocation, not the consumption-based cloud model.
Go deeper
Related to this question
Learn chapter
What is Cloud Computing?
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.
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.
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