The answer is the log group’s retention policy has deleted older logs. This is the most likely cause because the CLI output shows storedBytes is greater than zero, confirming logs were written, but the retention is set to 30 days, meaning any logs older than that have been automatically purged by CloudWatch. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding that Lambda logs are not missing due to permissions—AWSLambdaBasicExecutionRole already includes the necessary CreateLogGroup, CreateLogStream, and PutLogEvents actions—nor due to the function not running, since storedBytes would be zero if no invocations occurred. A common trap is assuming the IAM role is insufficient when the real issue is the retention window. Memory tip: “storedBytes > 0 but no logs? Check the retention clock—30 days and they’re gone.”
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.
Network Topology
A developer runs the above CLI command to check a Lambda function's logs. The function is invoked but no logs appear in CloudWatch. The IAM role for the Lambda function has the AWSLambdaBasicExecutionRole managed policy attached. 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 log group's retention policy has deleted older logs.
Option C is correct because the log group exists (storedBytes >0) but retention is 30 days, so logs older than 30 days are deleted. The developer may be looking at a timeframe beyond retention. Option A is incorrect because the role has the necessary permissions (AWSLambdaBasicExecutionRole includes CreateLogGroup, CreateLogStream, PutLogEvents). Option B is incorrect because the function is being invoked (otherwise storedBytes would be 0). Option D is incorrect because storedBytes is not zero, indicating logs were written.
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 log group's retention policy has deleted older logs.
Why this is correct
Retention 30 days may have purged logs.
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 CloudWatch Logs service is not enabled in the region.
Why it's wrong here
Log group exists, so service is enabled.
✗
The Lambda function's IAM role does not have permission to create log groups.
Why it's wrong here
The managed policy includes that permission.
✗
The Lambda function is not being invoked.
Why it's wrong here
StoredBytes >0 indicates previous invocations.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-C02 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.
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 log group's retention policy has deleted older logs. — Option C is correct because the log group exists (storedBytes >0) but retention is 30 days, so logs older than 30 days are deleted. The developer may be looking at a timeframe beyond retention. Option A is incorrect because the role has the necessary permissions (AWSLambdaBasicExecutionRole includes CreateLogGroup, CreateLogStream, PutLogEvents). Option B is incorrect because the function is being invoked (otherwise storedBytes would be 0). Option D is incorrect because storedBytes is not zero, indicating logs were written.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 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: "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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.