The answer is the bucket's 'Block public access' settings. This is the most likely cause of a 403 Forbidden error on an S3 static website because these settings act as a universal security override that denies all public requests, regardless of what the bucket policy allows. Even if your bucket policy explicitly grants s3:GetObject to everyone, enabling any of the Block Public Access options will block that access, returning a 403. On the AWS Certified Developer Associate DVA-C02 exam, this is a classic trap: you see a permissive bucket policy and assume it works, but the question will quietly mention that the bucket was created recently or that account-level settings are in play. The exam tests your understanding that S3’s security model is layered, with Block Public Access being the highest-priority gatekeeper. Memory tip: think of Block Public Access as a master kill switch—no matter what the policy says, if the switch is flipped, public traffic is dead on arrival.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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.
A developer is using Amazon S3 to host a static website. The website returns 403 Forbidden errors. The bucket policy allows public read access. 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
✓
The bucket's 'Block public access' settings are enabled.
The most likely cause is that the bucket's 'Block public access' settings are enabled. Even if the bucket policy explicitly grants public read access, S3's Block Public Access settings act as an overarching security override that denies all public requests, resulting in a 403 Forbidden error. These settings are enabled by default for new buckets and can be applied at the account or bucket level, making them a common pitfall.
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's 'Block public access' settings are enabled.
Why this is correct
Block public access settings override bucket policies.
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.
✗
The bucket has an ACL that denies read access.
Why it's wrong here
ACLs are not used when bucket policy grants access.
✗
The bucket policy does not include the 's3:GetObject' action.
Why it's wrong here
The scenario says the bucket policy allows public read access.
✗
The bucket policy is not correctly attached to the bucket.
Why it's wrong here
If attached, it should work unless blocked.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on the bucket policy syntax or ACLs, overlooking the fact that S3's Block Public Access settings can silently override all public permissions, even when the policy is perfectly written.
Trap categories for this question
Scenario analysis trap
The scenario says the bucket policy allows public read access.
Detailed technical explanation
How to think about this question
Amazon S3's Block Public Access settings are evaluated before any bucket policy or ACL, acting as a deny-all override for public requests. These settings can be applied at the account level via the PutAccountPublicAccessBlock API or at the bucket level, and they block any access that is not explicitly authorized via a VPC endpoint or AWS service principal. In a real-world scenario, a developer might enable these settings for compliance (e.g., SOC 2) and then wonder why a seemingly correct bucket policy fails to serve public content.
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.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The bucket's 'Block public access' settings are enabled. — The most likely cause is that the bucket's 'Block public access' settings are enabled. Even if the bucket policy explicitly grants public read access, S3's Block Public Access settings act as an overarching security override that denies all public requests, resulting in a 403 Forbidden error. These settings are enabled by default for new buckets and can be applied at the account or bucket level, making them a common pitfall.
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.
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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