This DOP-C02 practice question tests your understanding of security and compliance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 uses AWS Secrets Manager to rotate secrets for an RDS database. The rotation Lambda function fails with a timeout 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 Lambda function is not configured to access the VPC where the RDS instance resides.
The most likely cause of the timeout error is that the Lambda function is not configured to access the VPC where the RDS instance resides. When Secrets Manager rotates a secret for an RDS database, the rotation Lambda function must connect to the database to update the credentials. If the Lambda function is not attached to the same VPC (or a VPC with proper routing and security group rules), it cannot reach the RDS instance, causing network connection attempts to hang until the function times out.
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 Lambda function's execution role lacks the required IAM permissions.
Why it's wrong here
Would cause an access denied error, not a timeout.
✓
The Lambda function is not configured to access the VPC where the RDS instance resides.
Why this is correct
Without VPC access, Lambda cannot reach the database, causing timeout.
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 secret rotation schedule is set to less than 24 hours.
Why it's wrong here
Rotation schedule does not affect Lambda function execution.
✗
The Lambda function does not have permission to access the S3 bucket.
Why it's wrong here
Secrets Manager rotation does not require S3 access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse IAM permission errors (which produce immediate failures) with network connectivity issues (which cause timeouts), leading them to incorrectly select the IAM role option when the symptom is a timeout rather than an access denied error.
Detailed technical explanation
How to think about this question
When a Lambda function is configured to access a VPC, it uses an Elastic Network Interface (ENI) in a private subnet. Without VPC configuration, the function runs in a default AWS-managed VPC with no direct network path to an RDS instance in a customer VPC. The timeout occurs because the database client inside the Lambda function attempts a TCP connection to the RDS endpoint, which times out after the default 3-second TCP connect timeout or the Lambda function's configured timeout (often 3 minutes).
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.
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Lambda function is not configured to access the VPC where the RDS instance resides. — The most likely cause of the timeout error is that the Lambda function is not configured to access the VPC where the RDS instance resides. When Secrets Manager rotates a secret for an RDS database, the rotation Lambda function must connect to the database to update the credentials. If the Lambda function is not attached to the same VPC (or a VPC with proper routing and security group rules), it cannot reach the RDS instance, causing network connection attempts to hang until the function times out.
What should I do if I get this DOP-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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