DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 company has a Lambda function that writes to an S3 bucket. The IAM role used by the function has an inline policy allowing s3:PutObject on the bucket. However, writes fail with an access denied error. 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 S3 bucket has a bucket policy that denies the request.
Option D is correct because S3 bucket policies can explicitly deny access even if IAM allows it. Option A is wrong because the function role has permissions. Option B is wrong because S3 does not require VPC endpoints. Option C is wrong because KMS encryption requires additional permissions, but access denied could be due to bucket policy deny.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 S3 bucket is in a different region.
Why it's wrong here
Cross-region access is allowed by default.
✗
The S3 bucket uses SSE-KMS encryption and the function lacks kms:Decrypt permissions.
Why it's wrong here
KMS permissions could be an issue, but the error is access denied, not a KMS error.
✗
The Lambda function does not have the correct execution role.
Why it's wrong here
The role has an inline policy allowing PutObject.
✓
The S3 bucket has a bucket policy that denies the request.
Why this is correct
A bucket policy can override IAM permissions with an explicit deny.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DVA-C02 ACL questions on filtering logic and placement.
Development with AWS Services — This question tests Development with AWS Services — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The S3 bucket has a bucket policy that denies the request. — Option D is correct because S3 bucket policies can explicitly deny access even if IAM allows it. Option A is wrong because the function role has permissions. Option B is wrong because S3 does not require VPC endpoints. Option C is wrong because KMS encryption requires additional permissions, but access denied could be due to bucket policy deny.
What should I do if I get this DVA-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DVA-C02 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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Question Discussion
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