Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A gaming company runs a multiplayer game backend on Amazon EC2 instances. The game experiences variable traffic patterns: low usage during weekday mornings and high usage during evenings and weekends. The company uses an Auto Scaling group to automatically add instances during peak hours and remove them during low traffic. The company is billed only for the compute capacity actually consumed during each hour. Which characteristic of cloud computing does this usage-based billing model best illustrate?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Rapid elasticity
Rapid elasticity is the ability to quickly scale resources up or down based on demand. While the scenario includes Auto Scaling, the question specifically asks about the 'usage-based billing model', not the scaling capability. Therefore, rapid elasticity is not the characteristic being illustrated by the billing approach.
B
Best answer
Measured service
Measured service is the correct characteristic. Cloud providers meter usage at a granular level (e.g., per hour or per GB) and bill customers only for what they consume. In this scenario, the company pays only for the compute capacity used each hour, which is a textbook example of measured service.
C
Distractor review
Resource pooling
Resource pooling refers to the provider's ability to serve multiple customers from shared physical resources, with isolation at the virtual level. This characteristic is about multi-tenancy, not about how customers are billed. The scenario does not focus on multi-tenancy or shared infrastructure.
D
Distractor review
On-demand self-service
On-demand self-service means customers can provision computing resources automatically without requiring human interaction with the provider. While the Auto Scaling group automates provisioning, the question is about the usage-based billing model, not the provisioning process. Thus, on-demand self-service is not the characteristic being illustrated.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Measured service — The usage-based billing model in this scenario is a direct example of the measured service characteristic of cloud computing. Cloud providers meter usage (e.g., instance hours, storage) and charge customers only for what they consume, similar to how utilities charge for electricity. This contrasts with traditional on-premises models where hardware is purchased and paid for upfront regardless of actual usage. Rapid elasticity describes the ability to scale resources up/down automatically, while resource pooling refers to the multi-tenant sharing of physical resources. On-demand self-service refers to the ability to provision resources without human intervention, not the billing mechanism.
What should I do if I get this CLF-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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