The answer is that the Lambda function is not attached to a VPC with a NAT gateway or VPC endpoints for Secrets Manager. This is correct because when a Lambda function is configured to run inside a VPC, it loses default internet access and can only reach resources within that VPC unless a NAT gateway provides outbound connectivity or VPC interface endpoints allow direct, private access to AWS services like Secrets Manager. The timeout occurs because the rotation function can reach the database in a private subnet but cannot call the Secrets Manager API to fetch or update the secret, so the network call hangs until the 30-second Lambda timeout. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of VPC networking for Lambda, a common trap where developers increase timeout or memory instead of fixing the network path. Remember the mnemonic: “Lambda in a VPC needs a NAT or Endpoint to talk to AWS.”
DVA-C02 Security Practice Question
This DVA-C02 practice question tests your understanding of security. 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 is using AWS Secrets Manager to rotate database credentials automatically. The rotation Lambda function fails with a timeout error after 30 seconds. The developer checked the Lambda logs and saw that the function is making network calls to the database but never receives a response. 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.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
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 attached to a VPC with a NAT gateway or VPC endpoints for Secrets Manager.
Option A is correct because Lambda functions in a VPC require a NATgateway or VPC interface endpoints to access the internet or AWS services outside the VPC. The database is likely in a private subnet without internet access, and the Secrets Manager endpoint might be unreachable, causing the timeout. Options B, C, and D are incorrect because increasing timeout or memory would not solve network connectivity issues, and disabling rotation would not address the root cause.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 memory is insufficient; increase memory to 1024 MB.
Why it's wrong here
Memory affects CPU, not network connectivity.
✗
The Lambda function timeout is set too low; increase it to 5 minutes.
Why it's wrong here
While timeout might be low, the logs show no response from the database, indicating a network issue, not a timeout.
✓
The Lambda function is not attached to a VPC with a NAT gateway or VPC endpoints for Secrets Manager.
Why this is correct
Lambda needs network connectivity to both the database and Secrets Manager; without a NATgateway or VPC endpoints, it cannot reach Secrets Manager.
Clue confirmation
The clue words "most likely", "never" in the question point toward this answer.
The database credentials are incorrect; the rotation function cannot authenticate.
Why it's wrong here
The error is a timeout, not an authentication failure.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Trap categories for this question
Command / output trap
While timeout might be low, the logs show no response from the database, indicating a network issue, not a timeout.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Security — This question tests Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The Lambda function is not attached to a VPC with a NAT gateway or VPC endpoints for Secrets Manager. — Option A is correct because Lambda functions in a VPC require a NAT gateway or VPC interface endpoints to access the internet or AWS services outside the VPC. The database is likely in a private subnet without internet access, and the Secrets Manager endpoint might be unreachable, causing the timeout. Options B, C, and D are incorrect because increasing timeout or memory would not solve network connectivity issues, and disabling rotation would not address the root cause.
What should I do if I get this DVA-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "never". 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?
CIDR notation defines the prefix length.
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