AZ-900 Cloud Concepts Practice Questions
Roughly a quarter of the AZ-900 exam is the vocabulary of cloud computing itself — the economics, the service models and the reliability guarantees. These questions cover that ground.
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What to know for this section
CapEx vs OpEx
Capital expenditure is money spent up front on assets you own — servers, racks, a datacentre. Operational expenditure is money spent on services you consume as you go. Moving to the cloud is the classic CapEx-to-OpEx shift, and the exam tests that you can name which is which.
The three service models
IaaS gives you the virtual hardware and you manage the OS upward. PaaS gives you a managed runtime and you manage only your application and data. SaaS gives you finished software and you manage almost nothing. Knowing where responsibility transfers is the shared responsibility model.
Scalability, elasticity, availability
Scalability is the capacity to grow — vertically by making a resource bigger, horizontally by adding more of them. Elasticity is doing that automatically as demand moves. High availability is staying up despite component failure. They are distinct ideas and the exam mixes them up on purpose.