This DVA-C02 practice question tests your understanding of security. 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.
A developer is troubleshooting an issue where an IAM user cannot perform 's3:ListBucket' on a bucket. Which TWO factors could cause this denial?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An explicit deny statement in the bucket policy.
Option B is correct because an explicit deny statement in a bucket policy overrides any allow that might exist from an IAM policy or other sources. AWS IAM evaluates all policies (identity-based and resource-based) and an explicit deny always takes precedence, effectively blocking the s3:ListBucket action regardless of other permissions.
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 bucket is in a different region than the user's default region.
Why it's wrong here
Region does not affect IAM permissions for S3.
✓
An explicit deny statement in the bucket policy.
Why this is correct
Explicit denies override any allows.
Related concept
Read the scenario before looking for a memorised answer.
✗
The bucket is encrypted with AWS KMS.
Why it's wrong here
KMS encryption does not affect ListBucket permissions.
✗
The user has a permissions boundary that does not include s3:ListBucket.
Why it's wrong here
Permissions boundaries limit the maximum permissions but do not deny unless explicitly set.
✓
The user's IAM policy does not include s3:ListBucket.
Why this is correct
Without the action, the user cannot list the bucket.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse a permissions boundary with an explicit deny, thinking that a missing allow in the boundary blocks access, when in fact only an explicit deny or the absence of any allow (from all applicable policies) causes denial.
Detailed technical explanation
How to think about this question
Under the hood, AWS IAM policy evaluation logic follows an explicit deny override: if any policy (identity-based, resource-based, or boundary) includes an explicit deny for an action, the request is denied regardless of any allows. In contrast, a permissions boundary acts as a ceiling—it does not deny actions by omission; it only prevents allows that exceed its scope. Real-world scenarios often involve cross-account bucket policies where an explicit deny is used to block specific users while allowing others, making it a common troubleshooting point.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: An explicit deny statement in the bucket policy. — Option B is correct because an explicit deny statement in a bucket policy overrides any allow that might exist from an IAM policy or other sources. AWS IAM evaluates all policies (identity-based and resource-based) and an explicit deny always takes precedence, effectively blocking the s3:ListBucket action regardless of other permissions.
What should I do if I get this DVA-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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Question Discussion
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