AZ-900 - Describe Cloud Concepts (29% of the exam) - Section 1.1
Describe cloud computing including the shared responsibility model, cloud models, and the consumption-based model.
Define cloud computing and distinguish public, private, and hybrid cloud models, explaining who bears responsibility for each layer under the shared responsibility model. Recognise how the consumption-based model replaces upfront capital expenditure (CapEx) with operational expenditure (OpEx), and why that shift matters for budgeting.
shared responsibility modelpublic private and hybrid cloudconsumption-based modelCapEx versus OpExcloud computing
Practice question for this objective
lock_openFree sampleDescribe Cloud Conceptsmedium
A hybrid cloud lets a private cloud surge into public cloud resources to handle increased, temporary demand. Is this correct?
AYescheck_circle Correct
BNo
Hybrid cloud connects private and public so workloads can burst into public capacity when demand spikes. A hybrid cloud uses both public and private clouds in an inter-connected environment and can let a private cloud surge for increased, temporary demand by deploying public cloud resources.
Why A is correct: Correct. A hybrid cloud uses both public and private clouds in an inter-connected environment and can let a private cloud surge for increased, temporary demand by deploying public cloud resources.
Why B is wrong: Claiming this is impossible would be wrong, because the ability to surge into public resources during temporary demand is a defining hybrid cloud capability.
Answers that look right on this material and are not. Each one is a distractor from a different question in the AZ-900 bank for this domain.
Capital expenditure, the up-front purchase of long-lived infrastructure
Why it is wrong: Capital expenditure tempts candidates because traditional IT was bought up front, but cloud charges accrue as services are consumed rather than as a one-off asset purchase, so this label does not fit.
A public cloud only, with every workload placed on provider resources
Why it is wrong: A public-cloud-only approach runs everything on a third-party provider and attracts candidates who like its simplicity, but it offers no private side and therefore cannot let the team keep selected workloads private as the scenario requires.
Public cloud, by migrating all applications off the private hardware
Why it is wrong: Moving everything to a public cloud would scale for the peak and tempts candidates who equate public with elasticity, but it abandons the private cloud the retailer already runs rather than surging from it temporarily, so it overshoots the stated need.
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