The answer is to verify that the S3 bucket has an event notification configured for the Lambda function. This is the first check because an S3 event notification is the explicit trigger mechanism that tells S3 to invoke the Lambda function when an upload occurs; without this configuration, S3 simply stores the object and never sends an invocation request to Lambda. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of the event-driven architecture between S3 and Lambda, and the common trap is to immediately suspect code errors or IAM permissions when the real issue is a missing event notification—remember, CloudWatch Logs will only show execution logs if the function is actually triggered. A useful memory tip is "No notification, no invocation": if you see zero execution logs, always start by confirming the S3 event notification is properly configured for the specific bucket and event type.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 data engineer has set up an AWS Lambda function that processes files uploaded to an S3 bucket. The function is triggered by S3 event notifications. However, the function is not being invoked when a file is uploaded. The engineer checks the Lambda function's CloudWatch Logs and finds no execution logs. What should the engineer check FIRST?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify that the S3 bucket has an event notification configured for the Lambda function.
Option A is correct because the S3 bucket must have an event notification configured to trigger the Lambda function. Option B is wrong because function code errors would appear in logs after invocation. Option C is wrong because the IAM role affects execution, not invocation trigger. Option D is wrong because VPC configuration affects network access, not whether the function is triggered.
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.
✗
Check the Lambda function's code for errors.
Why it's wrong here
Errors in code would appear in logs after invocation.
✗
Verify that the Lambda function's IAM role has permissions to read from S3.
Why it's wrong here
Permissions are for execution, not for triggering.
✓
Verify that the S3 bucket has an event notification configured for the Lambda function.
Why this is correct
Without event notification, S3 will not invoke the function.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Check if the Lambda function is attached to a VPC.
Why it's wrong here
VPC configuration does not prevent invocation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Verify that the S3 bucket has an event notification configured for the Lambda function. — Option A is correct because the S3 bucket must have an event notification configured to trigger the Lambda function. Option B is wrong because function code errors would appear in logs after invocation. Option C is wrong because the IAM role affects execution, not invocation trigger. Option D is wrong because VPC configuration affects network access, not whether the function is triggered.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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