- A
Configure a NAT gateway in the public subnet to allow outbound internet access.
NAT enables internet from private subnet.
- B
Move the source stage to use S3 instead of CodeCommit.
Why wrong: Source stage is not the problem.
- C
Place the CodeBuild project in a private subnet of the VPC.
Private subnet is required for NAT routing.
- D
Assign a public IP address to the CodeBuild project.
Why wrong: Not sufficient with VPC routing.
- E
Create VPC endpoints for Amazon S3 to allow access to dependencies in S3.
VPC endpoints allow S3 access without internet.
Question 718 of 1,616
CodeBuild VPC Settings — NAT Gateway and S3 Endpoint for Dependencies
This DVA-C02 practice question tests your understanding of deployment. 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 to automate deployments. The pipeline has a source stage that pulls from CodeCommit, a build stage using CodeBuild, and a deploy stage using CodeDeploy. Recently, deployments have been failing because the CodeBuild project cannot download dependencies from the internet. The build environment does not have internet access due to VPC settings. Which THREE steps should a developer take to resolve this issue? (Choose THREE.)
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
✓
Configure a NAT gateway in the public subnet to allow outbound internet access.
The correct answers are A, C, and E. A: A NAT gateway in a public subnet allows instances in private subnets to access the internet, enabling CodeBuild to download dependencies. C: Placing the CodeBuild project in a private subnet (which it likely already is) is necessary for using the NAT gateway to route outbound traffic. E: VPC endpoints for Amazon S3 allow CodeBuild to access dependencies stored in S3 without requiring internet access. B is incorrect because moving the source to S3 does not address the lack of internet connectivity for downloading dependencies. D is incorrect because CodeBuild projects cannot be assigned public IP addresses; that is only possible for EC2 instances.
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.
- ✓
Configure a NAT gateway in the public subnet to allow outbound internet access.
- ✗
Move the source stage to use S3 instead of CodeCommit.
Why it's wrong here
Source stage is not the problem.
- ✓
Place the CodeBuild project in a private subnet of the VPC.
- ✗
Assign a public IP address to the CodeBuild project.
Why it's wrong here
Not sufficient with VPC routing.
- ✓
Create VPC endpoints for Amazon S3 to allow access to dependencies in S3.
Why this is correct
VPC endpoints allow S3 access without internet.
Related concept
CIDR notation defines the prefix length.
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 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.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Deployment — This question tests Deployment — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Configure a NAT gateway in the public subnet to allow outbound internet access. — The correct answers are A, C, and E. A: A NAT gateway in a public subnet allows instances in private subnets to access the internet, enabling CodeBuild to download dependencies. C: Placing the CodeBuild project in a private subnet (which it likely already is) is necessary for using the NAT gateway to route outbound traffic. E: VPC endpoints for Amazon S3 allow CodeBuild to access dependencies stored in S3 without requiring internet access. B is incorrect because moving the source to S3 does not address the lack of internet connectivity for downloading dependencies. D is incorrect because CodeBuild projects cannot be assigned public IP addresses; that is only possible for EC2 instances.
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.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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