- A
AWS Shield Standard
Why wrong: AWS Shield Standard is automatically enabled for all AWS customers at no cost. It provides basic protection against common DDoS attacks but does not offer financial protection against scaling costs, access to the DDoS Response Team (DRT), or integration with AWS WAF for advanced application-layer protection.
- B
AWS Shield Advanced
AWS Shield Advanced is a paid service that provides enhanced DDoS protection. It includes cost protection against scaling charges incurred during a DDoS attack, 24/7 access to the DDoS Response Team (DRT) for expert support, and integration with AWS WAF for application-layer attack mitigation. This matches all the requirements described in the scenario.
- C
AWS WAF
Why wrong: AWS WAF is a web application firewall that protects against common web exploits like SQL injection and cross-site scripting. While it can be integrated with Shield Advanced for application-layer protection, WAF alone does not provide DDoS protection at the network/transport layer, financial protection against scaling costs, or access to the DDoS Response Team (DRT).
- D
Amazon GuardDuty
Why wrong: Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior. It can detect DDoS activity as a signal but does not mitigate DDoS attacks, provide financial protection, or include access to a DRT. It is a detection tool, not a mitigation service.
Quick Answer
The answer is AWS Shield Advanced. This is the correct choice because it delivers enhanced DDoS protection with cost protection, meaning AWS will reimburse the scaling costs for EC2, ELB, CloudFront, and Route 53 that spike during an attack, while also providing 24/7 access to the DDoS Response Team (DRT) for real-time mitigation and native integration with AWS WAF for application-layer defense. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your ability to distinguish between Shield Standard (free, basic protection) and Shield Advanced (paid, with cost protection and DRT access). A common trap is selecting AWS WAF alone, but WAF handles only layer 7 rules and lacks the financial safeguards and expert response team. Remember the three pillars of Shield Advanced: cost protection, DRT access, and WAF integration. For a memory tip, think "Advanced = All three: cost, response, and WAF."
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. 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.
An e-commerce company runs a critical web application on Amazon EC2 instances behind an Application Load Balancer and Amazon CloudFront. The application has been experiencing frequent, large-scale DDoS attacks that cause significant compute and data transfer costs. The company wants to implement a managed DDoS protection service that provides financial protection against scaling costs incurred during DDoS attacks, access to a DDoS Response Team (DRT) for real-time attack mitigation support, and integration with AWS WAF for application-layer attack protection. Which AWS service should the company use to meet these requirements?
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
AWS Shield Advanced
AWS Shield Advanced is the correct choice because it provides enhanced DDoS protection with financial protection against scaling costs incurred during DDoS attacks (cost protection for EC2, ELB, CloudFront, and Route 53), 24/7 access to the DDoS Response Team (DRT) for real-time attack mitigation, and seamless integration with AWS WAF for application-layer attack protection. This fully managed service meets all three stated requirements, unlike the other options.
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.
- ✗
AWS Shield Standard
Why it's wrong here
AWS Shield Standard is automatically enabled for all AWS customers at no cost. It provides basic protection against common DDoS attacks but does not offer financial protection against scaling costs, access to the DDoS Response Team (DRT), or integration with AWS WAF for advanced application-layer protection.
- ✓
AWS Shield Advanced
Why this is correct
AWS Shield Advanced is a paid service that provides enhanced DDoS protection. It includes cost protection against scaling charges incurred during a DDoS attack, 24/7 access to the DDoS Response Team (DRT) for expert support, and integration with AWS WAF for application-layer attack mitigation. This matches all the requirements described in the scenario.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS WAF
Why it's wrong here
AWS WAF is a web application firewall that protects against common web exploits like SQL injection and cross-site scripting. While it can be integrated with Shield Advanced for application-layer protection, WAF alone does not provide DDoS protection at the network/transport layer, financial protection against scaling costs, or access to the DDoS Response Team (DRT).
- ✗
Amazon GuardDuty
Why it's wrong here
Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior. It can detect DDoS activity as a signal but does not mitigate DDoS attacks, provide financial protection, or include access to a DRT. It is a detection tool, not a mitigation service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Shield Standard (free, basic protection) with AWS Shield Advanced (paid, enhanced protection with cost protection and DRT access), or mistakenly think AWS WAF alone provides DDoS mitigation and financial safeguards, when in fact WAF is only an application-layer component that must be paired with Shield Advanced for the full solution.
Detailed technical explanation
How to think about this question
AWS Shield Advanced uses a combination of always-on traffic monitoring and inline mitigation engines at the AWS edge to detect and block DDoS attacks, with the DRT able to apply custom mitigations via AWS WAF rules or rate-based rules. The cost protection feature automatically applies credits for scaling costs (e.g., EC2, ELB, CloudFront data transfer) incurred due to DDoS attacks, up to the monthly subscription fee, which is critical for e-commerce companies facing large-scale attacks. Under the hood, Shield Advanced leverages the same infrastructure that protects AWS services, including flow-based anomaly detection and packet inspection at the network layer.
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.
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.
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Security and Compliance — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Shield Advanced — AWS Shield Advanced is the correct choice because it provides enhanced DDoS protection with financial protection against scaling costs incurred during DDoS attacks (cost protection for EC2, ELB, CloudFront, and Route 53), 24/7 access to the DDoS Response Team (DRT) for real-time attack mitigation, and seamless integration with AWS WAF for application-layer attack protection. This fully managed service meets all three stated requirements, unlike the other options.
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.
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 →
Same concept, more angles
1 more ways this is tested on CLF-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company hosts a public-facing web application on Amazon EC2 instances behind an Application Load Balancer. The security team has noticed an increase in volumetric distributed denial-of-service (DDoS) attacks targeting the application's IP address. The company wants a managed AWS service that provides automatic, always-on protection against common network-layer DDoS attacks at no additional cost. Which AWS service should the company use?
medium- A.AWS WAF
- ✓ B.AWS Shield Standard
- C.AWS Shield Advanced
- D.AWS Network Firewall
Why B: AWS Shield Standard is the correct choice because it provides automatic, always-on protection against common network-layer (Layer 3/4) DDoS attacks, such as SYN floods and UDP reflection attacks, at no additional cost. It is integrated with Elastic Load Balancing (ELB), Amazon CloudFront, and Amazon Route 53, making it ideal for protecting a public-facing web application behind an Application Load Balancer without requiring any configuration or extra fees.
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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.
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