The correct answer is to protect AWS resources against common DDoS attacks. AWS Shield Standard is a free, always-on service that automatically detects and mitigates infrastructure-layer Distributed Denial of Service attacks, such as SYN floods, UDP floods, and reflection attacks, using inline mitigation at the AWS edge without any configuration. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of the baseline security services included by default; a common trap is confusing Shield Standard with the paid Shield Advanced, which adds cost, attack diagnostics, and DDoS cost protection. Remember that Shield Standard is the no-cost, always-on layer for common threats, while Shield Advanced is the enhanced, paid option for sophisticated attacks. Memory tip: think “Standard = Starter, always on, no cost.”
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To protect AWS resources against common DDoS attacks
AWS Shield Standard is a free, always-on service that protects all AWS customers from common, infrastructure-layer Distributed Denial of Service (DDoS) attacks, such as SYN floods, UDP floods, and reflection attacks. It uses network flow monitoring and inline mitigation techniques at the AWS edge to automatically detect and block malicious traffic targeting AWS resources like EC2, ELB, CloudFront, and Route 53. This makes option B correct because its sole purpose is to provide baseline DDoS protection without any additional configuration or cost.
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.
✗
To encrypt data at rest in S3 buckets
Why it's wrong here
Shield Standard does not handle encryption; that is handled by SSE and KMS.
✓
To protect AWS resources against common DDoS attacks
Why this is correct
Shield Standard automatically protects all AWS customers against common DDoS attacks at no extra cost.
Related concept
Read the scenario before looking for a memorised answer.
✗
To monitor API calls made to AWS services
Why it's wrong here
API monitoring is done by CloudTrail, not Shield.
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To filter malicious web traffic using rules
Why it's wrong here
Rule-based filtering is provided by AWS WAF, not Shield Standard.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Shield Standard with AWS WAF, mistakenly thinking Shield Standard provides application-layer filtering (like SQL injection or XSS protection), when in fact it only handles infrastructure-layer DDoS attacks, while WAF is needed for Layer 7 web traffic inspection.
Detailed technical explanation
How to think about this question
Under the hood, AWS Shield Standard leverages the scale of the AWS global infrastructure to absorb and mitigate attacks, using techniques like SYN cookies, connection rate limiting, and traffic scrubbing at the edge locations. It automatically detects anomalies by analyzing network flow data against baseline traffic patterns, and it can mitigate attacks that exceed 100 Gbps by distributing traffic across AWS's massive capacity. A real-world scenario is a SYN flood targeting an EC2 instance behind an ELB; Shield Standard will automatically enable SYN cookies on the load balancer to prevent the instance from being overwhelmed, without any manual intervention.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CLF-C02 question in full detail.
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: To protect AWS resources against common DDoS attacks — AWS Shield Standard is a free, always-on service that protects all AWS customers from common, infrastructure-layer Distributed Denial of Service (DDoS) attacks, such as SYN floods, UDP floods, and reflection attacks. It uses network flow monitoring and inline mitigation techniques at the AWS edge to automatically detect and block malicious traffic targeting AWS resources like EC2, ELB, CloudFront, and Route 53. This makes option B correct because its sole purpose is to provide baseline DDoS protection without any additional configuration or cost.
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.
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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.
Question Discussion
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