AZ-900 Describe cloud concepts Practice Question
Which of the following is a key advantage of the public cloud model for a startup company with limited capital?
⚠ Common exam trap
It's easy for candidates to confuse the public cloud's lack of upfront cost with guaranteed performance or exclusive hardware, but the exam specifically tests the financial advantage of OpEx over CapEx for resource-constrained organizations.
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
✓
No upfront capital investment — pay only for resources used
For a startup with limited capital, the public cloud model eliminates the need for large upfront hardware purchases. Instead, it uses a consumption-based pricing model where you pay only for the compute, storage, and network resources you actually use, typically billed per second or per hour. This operational expenditure (OpEx) model directly addresses the capital expenditure (CapEx) constraints of a new company.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Complete control over all hardware configurations
Why it's wrong here
In public cloud services like Azure VMs, you manage only the guest OS, applications, and certain deployment configurations. The physical hardware – CPU firmware, BIOS, servers, rack power, and cooling – is fully abstracted and controlled by the cloud provider. This lack of hardware-level control differs from on-premises or private cloud, where you configure servers bottom-up, but it is precisely what enables rapid provisioning and elasticity.
- ✓
No upfront capital investment — pay only for resources used
Why this is correct
This is the defining benefit of the public cloud: a pay-as-you-go operating expenditure model replaces upfront capital investment in data-center hardware. You pay only for consumed compute, storage, and bandwidth, enabling startups to launch with minimal CapEx. Azure's reserved instances and scaling allow cost alignment with actual usage, while hardware procurement, maintenance, and refresh costs remain with the provider.
- ✗
Guaranteed highest possible performance at all times
Why it's wrong here
Cloud performance is inherently variable and depends on the selected VM size, storage IOPS, network latency, and current load on shared resources. While Azure offers SLAs for uptime and availability, it never promises the 'highest possible' performance at every moment. Burstable instance types and throttling policies further mean that peak performance is not contractually guaranteed.
- ✗
Exclusive use of physical hardware not shared with others
Why it's wrong here
In a public cloud, compute resources run on shared, multi-tenant physical infrastructure. The hypervisor isolates each customer's virtual machines, so you never own or exclusively lease the underlying server. Exclusive physical hardware is a feature of private cloud models or Azure Dedicated Host, not the standard public cloud consumption model.
Go deeper
Related to this question
Learn chapter
CapEx vs OpEx in Cloud Computing
Key term
Consumption-based pricing
Consumption-based pricing is a cloud billing model where you pay only for the resources you actually use, rather than paying a fixed upfront fee.
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.
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