Question 482 of 988
CLF-C02 Cloud Concepts Practice Question
A startup uses AWS Lambda for its backend processing. The company is billed only for the number of function invocations and the compute time consumed, rounded up to the nearest millisecond. There are no minimum fees or upfront commitments. This billing model is a direct example of which essential characteristic of cloud computing?
⚠ Common exam trap
It's easy for candidates to confuse 'measured service' with 'on-demand self-service' because both involve user control, but measured service specifically refers to the metering and pay-per-use billing model, not the ability to provision resources without human interaction.
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
✓
Measured service
The AWS Lambda billing model—charging only for function invocations and compute time rounded to the nearest millisecond, with no minimum fees or upfront commitments—directly exemplifies measured service. This essential characteristic of cloud computing means that resource usage is metered, monitored, and reported transparently, allowing customers to pay only for what they consume. In Lambda, the metering is granular: each invocation is counted, and duration is measured in 1-millisecond increments, enabling precise cost allocation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
On-demand self-service
Why it's wrong here
On-demand self-service means a consumer can provision computing capabilities automatically without requiring human interaction. While the startup can deploy Lambda functions without manual approval, the question specifically asks about the billing model based on consumption, not about the provisioning process.
When this WOULD be correct
A question asks: 'A company can provision and configure AWS resources through a web portal without contacting AWS support. Which cloud characteristic does this represent?' Then on-demand self-service would be correct.
- ✗
Resource pooling
Why it's wrong here
Resource pooling means the provider's computing resources are pooled to serve multiple consumers using a multi-tenant model. Charging per millisecond of compute time is a billing mechanism enabled by measured service, not a characteristic of how physical resources are shared.
When this WOULD be correct
A question asks: 'A cloud provider serves multiple customers from the same physical servers, using virtualization to isolate workloads. Which essential characteristic does this represent?' In that context, resource pooling would be the correct answer.
- ✓
Measured service
Why this is correct
Measured service is the characteristic where cloud systems automatically control and optimize resource use by leveraging a metering capability. Charging only for the actual compute time consumed (down to the millisecond) with no minimum fees is a direct demonstration of this metering and pay-per-use model.
- ✗
Broad network access
Why it's wrong here
Broad network access means resources are available over the network and can be accessed by standard mechanisms that promote use by heterogeneous thin or thick client platforms (e.g., mobile phones, laptops). The billing granularity described does not relate to network accessibility.
When this WOULD be correct
A question asks: 'A company's cloud resources can be accessed from any internet-connected device using standard protocols like HTTP and HTTPS. Which essential characteristic of cloud computing does this describe?'
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 CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Measured serviceCorrect answer▾
Why this is correct
Measured service is the characteristic where cloud systems automatically control and optimize resource use by leveraging a metering capability. Charging only for the actual compute time consumed (down to the millisecond) with no minimum fees is a direct demonstration of this metering and pay-per-use model.
✗On-demand self-serviceWrong answer — click to see why▾
Why this is wrong here
The question describes billing based on usage (invocations and compute time), which directly exemplifies measured service, not on-demand self-service. On-demand self-service refers to users provisioning resources without human interaction, not the billing model.
★ When this WOULD be the correct answer
A question asks: 'A company can provision and configure AWS resources through a web portal without contacting AWS support. Which cloud characteristic does this represent?' Then on-demand self-service would be correct.
Why candidates choose this
Candidates may confuse the ability to use services as needed (on-demand) with the metering and billing aspect, thinking that paying only for what you use is part of self-service.
✗Resource poolingWrong answer — click to see why▾
Why this is wrong here
Resource pooling refers to the provider's computing resources being pooled to serve multiple customers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to demand. The question describes billing based on usage (invocations and compute time), which is measured service, not resource pooling.
★ When this WOULD be the correct answer
A question asks: 'A cloud provider serves multiple customers from the same physical servers, using virtualization to isolate workloads. Which essential characteristic does this represent?' In that context, resource pooling would be the correct answer.
Why candidates choose this
Candidates may confuse resource pooling with pay-per-use billing because both involve shared infrastructure and variable costs, but resource pooling is about multi-tenancy and location independence, not billing granularity.
✗Broad network accessWrong answer — click to see why▾
Why this is wrong here
Broad network access refers to the ability to access cloud resources over the network via standard protocols, not to billing based on usage. The question specifically describes a pay-per-use billing model, which is measured service.
★ When this WOULD be the correct answer
A question asks: 'A company's cloud resources can be accessed from any internet-connected device using standard protocols like HTTP and HTTPS. Which essential characteristic of cloud computing does this describe?'
Why candidates choose this
Candidates may confuse 'broad network access' with any cloud feature involving network connectivity, or they may think that billing based on usage implies network access is required to meter usage.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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Same concept, more angles
1 more way this is tested on CLF-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company runs a nightly batch processing job on AWS that takes exactly 2 hours to complete. The company uses a fixed set of Amazon EC2 instances for the job. AWS automatically tracks the number of instance-hours consumed each month and bills the company precisely for that usage. The company does not need to sign a long-term contract or pay for idle resources. Which essential characteristic of cloud computing does this scenario best illustrate?
medium- A.Resource pooling
- ✓ B.Measured service
- C.Rapid elasticity
- D.Broad network access
Why B: The scenario describes AWS automatically tracking and billing precisely for the number of instance-hours consumed each month, without requiring a long-term contract or payment for idle resources. This directly illustrates the 'measured service' characteristic, where cloud resource usage is metered, monitored, and reported transparently, enabling pay-as-you-go billing. The fixed 2-hour nightly job and exact billing per instance-hour confirm that usage is measured and charged accordingly.
Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services 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 CLF-C02 exam.
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