Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has a development environment running on Amazon EC2 instances. To control costs, the team wants to set a monthly budget of $5,000 for this environment. If the forecasted cost for the month exceeds $6,000 (20% over budget), they want AWS to automatically stop all non-critical EC2 instances to prevent further spending. Which AWS feature should the team use to implement this automated cost control?
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
AWS Cost Explorer
AWS Cost Explorer is a tool for visualizing, understanding, and analyzing your costs and usage. It does not provide the ability to define automated actions when budget thresholds are exceeded. Therefore, it cannot automatically stop EC2 instances.
B
Best answer
AWS Budgets with budget actions
AWS Budgets enables you to set custom budgets (e.g., monthly cost budget). With budget actions, you can configure automated responses when actual or forecasted costs exceed budget thresholds. For example, you can define an action to stop non-critical EC2 instances when the forecast exceeds $6,000. This fully meets the requirement.
C
Distractor review
AWS Trusted Advisor
AWS Trusted Advisor inspects your AWS environment and makes recommendations across categories including cost optimization. It can identify underutilized instances but does not execute automated actions (like stopping instances) based on budget thresholds. It is a recommendation engine, not an automation tool.
D
Distractor review
AWS Cost Anomaly Detection
AWS Cost Anomaly Detection uses machine learning to detect unusual spending patterns and sends alerts via email or Amazon SNS. It does not support automated remediation actions such as stopping EC2 instances. Its purpose is detection and notification, not automated response.
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: AWS Budgets with budget actions — AWS Budgets allows users to create budgets and attach budget actions that take automated steps (such as stopping EC2 instances, applying IAM policies, or modifying resource tags) when actual or forecasted costs exceed specified thresholds. This enables proactive cost governance without manual intervention. Cost Explorer provides cost visualization and analysis but does not trigger actions. Trusted Advisor offers cost optimization recommendations but does not automate remediation. Cost Anomaly Detection identifies unusual spending patterns and sends alerts, but does not execute actions like stopping instances.
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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