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Question 80 of 1,740

SDLC Automation →hardMultiple SelectObjective-mapped

Quick Answer

The answer is to ensure the CodeBuild project's VPC configuration includes a NAT gateway for outbound internet access and to increase the Test stage timeout. When a CodeBuild project runs inside a VPC, it loses default internet access; a NAT gateway in a public subnet provides the necessary route for the build environment to reach external endpoints, such as package repositories or APIs required by integration tests. This directly addresses the intermittent timeout failures caused by network requests hanging indefinitely. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of VPC networking for CodeBuild, a common pitfall where candidates mistakenly adjust security groups or compute types instead of fixing the routing. Remember the key trap: VPC-enabled CodeBuild is isolated by design, so you must explicitly add a NAT gateway for outbound traffic. A useful memory tip is "NAT for out, timeout for in"—meaning a NAT gateway resolves outbound connectivity timeouts, while increasing the timeout value prevents premature stage failures.

DOP-C02 SDLC Automation 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. 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 CodePipeline with multiple stages: Source (CodeCommit), Build (CodeBuild), Test (CodeBuild), and Deploy (CodeDeploy to EC2). The Test stage runs integration tests that require network access to a private database in a VPC. The CodeBuild project is configured to use a VPC. However, the Test stage fails intermittently with timeout errors. Which TWO actions would MOST likely resolve the issue? (Choose 2)

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.

Question 1hardmulti select

Full question →

A
Remove the VPC configuration from the CodeBuild project and use a public subnet instead.
Why wrong: Without VPC, CodeBuild cannot access private resources.
B
Increase the timeout for the Test stage in the CodeBuild project to accommodate network delays.
Intermittent timeouts may be due to network congestion; increasing timeout provides buffer.
C
Ensure the CodeBuild project's VPC configuration includes a NAT gateway for internet access.
If tests need internet access (e.g., to download dependencies), a NAT gateway is required.
D
Use a larger compute type for the CodeBuild project to improve network performance.
Why wrong: Compute type does not directly affect network latency or timeout errors.
E
Configure the security group for the CodeBuild project to allow outbound traffic to the database security group on the required port.
Why wrong: This is already needed but not the intermittent timeout issue; timeouts suggest network path issues.

Full breakdown with real-world context →

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

✓

Increase the timeout for the Test stage in the CodeBuild project to accommodate network delays.

Options A and D are correct. Using a NAT gateway ensures outbound internet access if needed, and increasing the timeout prevents premature timeouts. Option B is incorrect because security groups should be permissive within the VPC. Option C is incorrect because Subnet IDs are required for VPC configuration. Option E is incorrect because compute type does not affect network.

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.

✗
Remove the VPC configuration from the CodeBuild project and use a public subnet instead.
Why it's wrong here
Without VPC, CodeBuild cannot access private resources.
✓
Increase the timeout for the Test stage in the CodeBuild project to accommodate network delays.
Why this is correct
Intermittent timeouts may be due to network congestion; increasing timeout provides buffer.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✓
Ensure the CodeBuild project's VPC configuration includes a NAT gateway for internet access.
Why this is correct
If tests need internet access (e.g., to download dependencies), a NAT gateway is required.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
Use a larger compute type for the CodeBuild project to improve network performance.
Why it's wrong here
Compute type does not directly affect network latency or timeout errors.
✗
Configure the security group for the CodeBuild project to allow outbound traffic to the database security group on the required port.
Why it's wrong here
This is already needed but not the intermittent timeout issue; timeouts suggest network path issues.

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.

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 DOP-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Increase the timeout for the Test stage in the CodeBuild project to accommodate network delays. — Options A and D are correct. Using a NAT gateway ensures outbound internet access if needed, and increasing the timeout prevents premature timeouts. Option B is incorrect because security groups should be permissive within the VPC. Option C is incorrect because Subnet IDs are required for VPC configuration. Option E is incorrect because compute type does not affect network.

What should I do if I get this DOP-C02 question wrong?

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?

CIDR notation defines the prefix length.

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