- A
The CodeBuild project is not configured with the correct VPC subnets.
Correct: The CodeBuild project's VPC subnets must match the subnets where the SonarQube server resides. Incorrect subnets prevent network connectivity, causing a timeout.
- B
The security group for the SonarQube server does not allow inbound traffic on port 9000 from the CodeBuild security group.
Why wrong: Incorrect: The scenario explicitly states the security group allows inbound traffic on port 9000 from the CodeBuild security group, so this is not the cause.
- C
The SonarQube server is using a self-signed certificate that CodeBuild does not trust.
Why wrong: Incorrect: A self-signed certificate would cause an SSL handshake error, not a TCP timeout. The connection fails before any certificate validation.
- D
The CodeBuild project does not have internet access, so it cannot reach the SonarQube server.
Why wrong: Incorrect: Internet access is not required because the SonarQube server is in the same VPC. The issue is with VPC routing, not internet connectivity.
DOP-C02 AWS CodeBuild VPC configuration Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: aWS CodeBuild VPC configuration. 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 CodeBuild to compile a Java application. The buildspec.yml includes a 'pre_build' phase that runs SonarQube for static code analysis. The analysis requires access to a private SonarQube server hosted on an EC2 instance in the same VPC. The CodeBuild project is configured with a VPC ID, subnet IDs, and security group IDs. However, the build fails with a timeout when trying to connect to the SonarQube server. The security group for the SonarQube server allows inbound traffic on port 9000 from the CodeBuild security group. What is the MOST likely reason for the failure?
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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The CodeBuild project is not configured with the correct VPC subnets.
Option A is correct because the timeout indicates a network connectivity issue despite the security group being correctly configured. The CodeBuild project must be in the same subnets as the SonarQube server to route traffic properly. If the subnets are incorrect, traffic cannot reach the server even if the security group allows it. Option B is incorrect because the security group rule is described as allowing traffic from the CodeBuild security group; the issue is not with the security group configuration.
Key principle: AWS CodeBuild VPC configuration
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 CodeBuild project is not configured with the correct VPC subnets.
Why this is correct
Correct: The CodeBuild project's VPC subnets must match the subnets where the SonarQube server resides. Incorrect subnets prevent network connectivity, causing a timeout.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
AWS CodeBuild VPC configuration
- ✗
The security group for the SonarQube server does not allow inbound traffic on port 9000 from the CodeBuild security group.
Why it's wrong here
Incorrect: The scenario explicitly states the security group allows inbound traffic on port 9000 from the CodeBuild security group, so this is not the cause.
- ✗
The SonarQube server is using a self-signed certificate that CodeBuild does not trust.
- ✗
The CodeBuild project does not have internet access, so it cannot reach the SonarQube server.
Why it's wrong here
Incorrect: Internet access is not required because the SonarQube server is in the same VPC. The issue is with VPC routing, not internet connectivity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates focus on the security group rule described in the scenario and assume it's misconfigured, but the real issue is subnet misconfiguration. The timeout points to a network routing problem, not a security group rule.
Trap categories for this question
Scenario analysis trap
Incorrect: The scenario explicitly states the security group allows inbound traffic on port 9000 from the CodeBuild security group, so this is not the cause.
Detailed technical explanation
How to think about this question
When CodeBuild runs in a VPC, it uses Elastic Network Interfaces (ENIs) attached to the specified subnets. The security group assigned to CodeBuild must allow outbound traffic (by default, all outbound is allowed), and the SonarQube server's security group must have an inbound rule allowing TCP port 9000 from the CodeBuild security group. A timeout occurs when the TCP SYN packet is sent but no SYN-ACK is received, often because the inbound rule is missing, uses the wrong security group ID, or the rule is not yet propagated. In real-world scenarios, verifying security group rules with tools like `telnet` or `nc` from a similar instance can isolate the issue.
KKey Concepts to Remember
- AWS CodeBuild VPC configuration
- Security group rules
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
AWS CodeBuild VPC configuration
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review aWS CodeBuild VPC configuration, then practise related DOP-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — AWS CodeBuild VPC configuration.
What is the correct answer to this question?
The correct answer is: The CodeBuild project is not configured with the correct VPC subnets. — Option A is correct because the timeout indicates a network connectivity issue despite the security group being correctly configured. The CodeBuild project must be in the same subnets as the SonarQube server to route traffic properly. If the subnets are incorrect, traffic cannot reach the server even if the security group allows it. Option B is incorrect because the security group rule is described as allowing traffic from the CodeBuild security group; the issue is not with the security group configuration.
What should I do if I get this DOP-C02 question wrong?
Review aWS CodeBuild VPC configuration, then practise related DOP-C02 questions on the same topic to reinforce the concept.
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?
AWS CodeBuild VPC configuration
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Last reviewed: Jun 11, 2026
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