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.
Refer to the exhibit. A developer created the CloudFormation template snippet. After deployment, the developer uploads a file to the bucket, but the Lambda function is not invoked. 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 has a bucket policy that denies s3:PutObject for the IAM user.
Option A is correct because S3 bucket policies that deny s3:PutObject would prevent the upload from triggering the event. Option B is wrong because versioning does not affect notifications. Option C is wrong because lifecycle rules do not affect immediate events. Option D is wrong because Lambda function errors do not prevent invocation.
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 bucket has a bucket policy that denies s3:PutObject for the IAM user.
Why this is correct
If the upload fails due to permissions, no event is sent.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The bucket has versioning enabled, which blocks event notifications.
Why it's wrong here
Versioning does not block notifications.
✗
The lifecycle rule moves objects to Glacier before the notification is sent.
Why it's wrong here
Lifecycle rules operate on a schedule, not immediately.
✗
The Lambda function returned an error, so the invocation failed silently.
Why it's wrong here
Lambda errors do not prevent invocation.
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 bucket has a bucket policy that denies s3:PutObject for the IAM user. — Option A is correct because S3 bucket policies that deny s3:PutObject would prevent the upload from triggering the event. Option B is wrong because versioning does not affect notifications. Option C is wrong because lifecycle rules do not affect immediate events. Option D is wrong because Lambda function errors do not prevent invocation.
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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