- A
On-demand self-service
Why wrong: 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.
- B
Resource pooling
Why wrong: 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.
- C
Measured service
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.
- D
Broad network access
Why wrong: 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.
CLF-C02 Cloud Concepts Practice Question
This CLF-C02 practice question tests your understanding of cloud concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates 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.
Detailed technical explanation
How to think about this question
Under the hood, AWS Lambda's measured service relies on a metering system that tracks two key metrics: the number of invocations and the duration of each execution, rounded up to the nearest millisecond. This metering is performed at the hypervisor level using AWS's internal telemetry, and the data is aggregated into billing records via the AWS Cost and Usage Report. A subtle behavior is that Lambda rounds duration to the nearest millisecond only for billed time, but the actual execution time may be shorter; this granularity enables startups to optimize costs by reducing cold starts and code inefficiencies.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Cloud Concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Cloud Concepts practice questions
Targeted practice on this topic area only
- →
All CLF-C02 questions
1,024 questions across all exam domains
- →
AWS Certified Cloud Practitioner CLF-C02 study guide
Full concept coverage aligned to exam objectives
- →
CLF-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CLF-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Cloud Concepts practice questions
Practise CLF-C02 questions linked to Cloud Concepts.
Security and Compliance practice questions
Practise CLF-C02 questions linked to Security and Compliance.
Cloud Technology and Services practice questions
Practise CLF-C02 questions linked to Cloud Technology and Services.
Billing, Pricing, and Support practice questions
Practise CLF-C02 questions linked to Billing, Pricing, and Support.
AWS shared responsibility model practice questions
Practise CLF-C02 questions linked to AWS shared responsibility model.
AWS IAM practice questions
Practise CLF-C02 questions linked to AWS IAM.
AWS pricing practice questions
Practise CLF-C02 questions linked to AWS pricing.
AWS support plans practice questions
Practise CLF-C02 questions linked to AWS support plans.
AWS S3 practice questions
Practise CLF-C02 questions linked to AWS S3.
AWS EC2 practice questions
Practise CLF-C02 questions linked to AWS EC2.
Practice this exam
Start a free CLF-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Concepts — This question tests Cloud Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More CLF-C02 practice questions
- A company publishes a message each time a new product is added to its catalogue. Three services need to receive this mes…
- A media company stores frequently accessed video thumbnails in Amazon S3. The thumbnails are read multiple times every d…
- A company needs a service to translate domain names (like www.example.com) into IP addresses, check the health of their…
- A startup runs an application on AWS and receives a monthly bill that charges exactly for the number of compute hours us…
- A financial institution runs its core banking application on-premises due to regulatory requirements. It has connected i…
- A company wants to run a MySQL database in AWS without managing database software installation, applying patches, settin…
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.