This DVA-C02 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 deploying a Lambda function that processes images uploaded to an S3 bucket. The function is triggered by S3 events. After deployment, the function does not execute when new images are uploaded. 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 does not have an event notification configured for the Lambda function.
The most likely cause is that the S3 bucket does not have an event notification configured to invoke the Lambda function. S3 event notifications must be explicitly set on the bucket to trigger a Lambda function when objects are created; without this configuration, S3 will not send any invocation request to Lambda, regardless of the function's permissions or settings.
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 S3 bucket does not have an event notification configured for the Lambda function.
Why this is correct
Notification is needed to trigger Lambda.
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 Lambda function memory is set too low.
Why it's wrong here
Memory affects execution, not triggering.
✗
The Lambda function does not have permission to read from the S3 bucket.
Why it's wrong here
Would cause function to fail, not prevent trigger.
✗
The Lambda function is not in the same region as the S3 bucket.
Why it's wrong here
Cross-region triggers are possible.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the trigger configuration (S3 event notification) with the function's permissions (IAM execution role), assuming that if the function has read access to S3, it will automatically be triggered, when in fact the event notification is a separate, mandatory setup step.
Detailed technical explanation
How to think about this question
Under the hood, S3 event notifications use a push model where S3 sends an invocation request to the Lambda function's Invoke API endpoint. The notification configuration is defined in the S3 bucket's notification subresource (XML/JSON), and the Lambda function must have a resource-based policy (via AddPermission) that grants the S3 service principal (s3.amazonaws.com) the lambda:InvokeFunction action. A common subtlety is that the S3 bucket and Lambda function can be in different regions, but the notification configuration must reference the function's ARN exactly, and the function's policy must allow cross-region invocation.
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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The S3 bucket does not have an event notification configured for the Lambda function. — The most likely cause is that the S3 bucket does not have an event notification configured to invoke the Lambda function. S3 event notifications must be explicitly set on the bucket to trigger a Lambda function when objects are created; without this configuration, S3 will not send any invocation request to Lambda, regardless of the function's permissions or settings.
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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