Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs a monthly batch data analytics job that requires 50 compute instances for exactly 2 hours. On AWS, the company launches 50 Amazon EC2 instances, runs the job, and then terminates all instances. The company's AWS bill shows a charge for only 100 instance-hours (50 instances × 2 hours). Which essential characteristic of cloud computing does this billing model best demonstrate?
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
Resource pooling
Resource pooling refers to the provider's computing resources being pooled to serve multiple customers, with physical and virtual resources dynamically assigned based on demand. While AWS does pool resources, the billing aspect in this scenario is not about pooling; it is about paying only for what is used.
B
Best answer
Measured service
Measured service means that cloud resource usage is metered, monitored, controlled, and reported, enabling a pay-per-use billing model. In this scenario, the company is charged exactly for the 100 instance-hours consumed, which is a direct application of measured service.
C
Distractor review
On-demand self-service
On-demand self-service allows a consumer to provision computing capabilities unilaterally without requiring human interaction. Although the company does launch and terminate instances without manual approval, the question specifically asks about the billing model, which is not the primary characteristic demonstrated by on-demand self-service.
D
Distractor review
Rapid elasticity
Rapid elasticity enables resources to be quickly scaled up and down. The company scales from 0 to 50 instances and back, but the billing model—paying only for the resources consumed—is the key point, not the speed of scaling.
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 scenario clearly highlights the pay-per-use billing model, where the company is charged only for the exact resources consumed (100 instance-hours). This is a direct example of the 'measured service' essential characteristic of cloud computing, as defined by NIST: cloud systems automatically control and optimize resource use by leveraging a metering capability, providing transparency for both the provider and consumer. The other characteristics (resource pooling, on-demand self-service, and rapid elasticity) are also present in the scenario but are not the primary focus of the billing aspect described.
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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