Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company operates a global e-commerce website behind Amazon CloudFront. Security analysts have noticed a pattern of SQL injection attempts and cross-site scripting attacks targeting the web application. The company needs a fully managed service that can inspect incoming HTTP(S) requests and block these common web exploits before they reach the application origin. The solution must integrate with CloudFront and allow the security team to author custom rules. Which AWS service should the company use?
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 Shield Advanced
AWS Shield Advanced provides enhanced protection against Distributed Denial of Service (DDoS) attacks, but it does not inspect application-layer traffic for threats like SQL injection or cross-site scripting. It is not designed for web application firewall (WAF) functionality.
B
Best answer
AWS WAF
AWS WAF is a web application firewall that monitors and filters web requests for common attack patterns such as SQL injection and cross-site scripting. It integrates with CloudFront and allows you to define custom rules to block malicious traffic before it reaches your application.
C
Distractor review
Amazon GuardDuty
Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior using machine learning and threat intelligence. However, it does not actively block or filter incoming requests; it generates alerts and findings that require further investigation or action.
D
Distractor review
AWS Firewall Manager
AWS Firewall Manager is a centralized management service that helps you configure and manage firewall rules across multiple accounts and resources. It can manage AWS WAF rules, but the actual filtering is performed by AWS WAF, not Firewall Manager itself. For the requirement of inspecting and blocking web exploits, you need AWS WAF directly.
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 WAF — AWS WAF is a web application firewall that monitors and filters web requests for common attack patterns such as SQL injection and cross-site scripting. It integrates directly with Amazon CloudFront, allowing you to create custom rules to filter and block malicious requests. AWS Shield Advanced focuses on DDoS protection, Amazon GuardDuty is a threat detection service that generates alerts but does not actively block requests, and AWS Firewall Manager is a centralized policy management tool that can manage AWS WAF rules but does not perform the filtering itself.
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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