The answer is that S3 Block Public Access settings are enabled, overriding the bucket policy. This occurs because S3 Block Public Access acts as a higher-order security control that explicitly denies all public access, regardless of what a bucket policy or ACL permits. Even if a bucket policy grants anonymous access to a specific IP range, enabling any of the four Block Public Access settings—especially “Block public access to buckets and objects granted through new policies”—will cause the policy to be ignored, resulting in access denied errors. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how S3 security layers interact, often appearing as a trap where you might assume a valid policy alone guarantees access. The key insight is that S3 Block Public Access settings override bucket policies, not the other way around. Memory tip: think of Block Public Access as a master kill switch—once flipped, no policy can turn public access back on.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. A company has attached the IAM policy to an S3 bucket named example-bucket. Users report they cannot access objects in the bucket even when coming from the allowed IP range. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
S3 Block Public Access settings are enabled, overriding the policy
The policy allows anonymous access (Principal: "*"). However, S3 bucket policies require explicit context; if the bucket is not configured for public access, the policy is ignored. Option C is correct because S3 Block Public Access settings can override the policy. Option A is wrong because the policy does allow from that range. Option B is wrong because the condition is correct. Option D is wrong because the policy is valid.
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.
✗
The policy syntax is invalid because of the Principal element
Why it's wrong here
Principal: "*" is valid for public access.
✗
The IP address range in the condition does not match the users' IP
Why it's wrong here
The policy explicitly allows the range.
✗
The condition uses aws:SourceIp incorrectly
Why it's wrong here
It is used correctly.
✓
S3 Block Public Access settings are enabled, overriding the policy
Why this is correct
Block Public Access denies all public access even if the bucket policy allows it.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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
Got this wrong? Here's your next step.
Identify which ANS-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.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: S3 Block Public Access settings are enabled, overriding the policy — The policy allows anonymous access (Principal: "*"). However, S3 bucket policies require explicit context; if the bucket is not configured for public access, the policy is ignored. Option C is correct because S3 Block Public Access settings can override the policy. Option A is wrong because the policy does allow from that range. Option B is wrong because the condition is correct. Option D is wrong because the policy is valid.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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