Quick Answer
The correct answer is Amazon S3 Block Public Access and AWS Trusted Advisor. Amazon S3 Block Public Access provides a centralized control that overrides any bucket policies or object permissions that would allow public access, effectively acting as a safety net at both the bucket and account level. AWS Trusted Advisor complements this by continuously scanning your S3 bucket permissions and flagging any buckets that are publicly accessible, serving as a proactive auditing tool. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of preventive versus detective controls for data exposure, and a common trap is confusing encryption services like S3 SSE-KMS or network controls like security groups with public access prevention. Remember that Block Public Access is the shield that stops public access before it happens, while Trusted Advisor is the alarm that tells you if a bucket is already exposed. A useful memory tip is “Block first, then Trust” — implement Block Public Access as your default, then rely on Trusted Advisor to catch any misconfigurations.
This DEA-C01 practice question tests your understanding of data security and governance. 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.
Which TWO AWS services can be used to protect sensitive data stored in Amazon S3 by preventing accidental public access? (Choose two.)
AWS WAF
Why wrong: Web application firewall, not for S3 public access.
Amazon GuardDuty
Why wrong: Threat detection, not for preventing public access.
AWS Trusted Advisor
Provides S3 bucket permissions check and recommendations.
Amazon S3 Block Public Access
Explicitly blocks public access to S3 buckets.
AWS Key Management Service (KMS)
Why wrong: Manages encryption keys, not public access.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Trusted Advisor
Amazon S3 Block Public Access (option C) is a service that blocks public access at the bucket or account level. AWS Trusted Advisor (option D) has a check for S3 bucket permissions that can identify publicly accessible buckets. Option A is for network security, not S3. Option B is for malware protection. Option E is for encryption at rest, not public access prevention.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS WAF
Why it's wrong here
Web application firewall, not for S3 public access.
Amazon GuardDuty
Why it's wrong here
Threat detection, not for preventing public access.
AWS Trusted Advisor
Why this is correct
Provides S3 bucket permissions check and recommendations.
Related concept
Read the scenario before looking for a memorised answer.
Amazon S3 Block Public Access
Why this is correct
Explicitly blocks public access to S3 buckets.
Related concept
Read the scenario before looking for a memorised answer.
AWS Key Management Service (KMS)
Why it's wrong here
Manages encryption keys, not public access.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Security and Governance — study guide chapter
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FAQ
Data Security and Governance — This question tests Data Security and Governance — Read the scenario before looking for a memorised answer..
The correct answer is: AWS Trusted Advisor — Amazon S3 Block Public Access (option C) is a service that blocks public access at the bucket or account level. AWS Trusted Advisor (option D) has a check for S3 bucket permissions that can identify publicly accessible buckets. Option A is for network security, not S3. Option B is for malware protection. Option E is for encryption at rest, not public access prevention.
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 20, 2026
This DEA-C01 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 DEA-C01 exam.
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