- A
A unit test is failing; fix the test code.
Why wrong: Unit tests fail with assertions, not network errors.
- B
The npm cache is corrupted; clear the cache in CodeBuild.
Why wrong: No npm cache in CodeBuild.
- C
The build environment lacks outbound internet access; configure a NAT gateway or use a VPC endpoint for npm.
Network errors indicate connectivity issues.
- D
The npm token has expired; regenerate the token.
Why wrong: Token expiry gives 401, not ECONNRESET.
Question 308 of 1,616
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 CodeBuild to deploy a Node.js application. The build fails intermittently with 'npm ERR! network' errors. What is the most likely cause and solution?
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 build environment lacks outbound internet access; configure a NAT gateway or use a VPC endpoint for npm.
The 'npm ERR! network' error indicates that npm cannot reach the registry to download packages. In AWS CodeBuild, if the build environment is configured inside a VPC without outbound internet access, npm requests will fail. The solution is to either place the build environment in a public subnet with a NAT gateway or use a VPC endpoint for npm (e.g., Amazon S3 or AWS CodeArtifact) to allow outbound HTTPS traffic.
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.
- ✗
A unit test is failing; fix the test code.
Why it's wrong here
Unit tests fail with assertions, not network errors.
- ✗
The npm cache is corrupted; clear the cache in CodeBuild.
Why it's wrong here
No npm cache in CodeBuild.
- ✓
The build environment lacks outbound internet access; configure a NAT gateway or use a VPC endpoint for npm.
Why this is correct
Network errors indicate connectivity issues.
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 npm token has expired; regenerate the token.
Why it's wrong here
Token expiry gives 401, not ECONNRESET.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume 'npm ERR! network' is always a cache or token issue, overlooking the VPC networking configuration that CodeBuild inherits from its environment settings.
Detailed technical explanation
How to think about this question
CodeBuild environments in a VPC use elastic network interfaces but do not automatically get a public IP or internet gateway route. Without a NAT gateway or VPC endpoints, outbound traffic to the npm registry (typically over HTTPS on port 443) is blocked. A VPC endpoint for AWS CodeArtifact can serve as a proxy for npm packages, avoiding the need for internet access entirely. The intermittent nature of the failure may occur if some builds run in a different subnet or if the NAT gateway has limited bandwidth.
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.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Troubleshooting and Optimization — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The build environment lacks outbound internet access; configure a NAT gateway or use a VPC endpoint for npm. — The 'npm ERR! network' error indicates that npm cannot reach the registry to download packages. In AWS CodeBuild, if the build environment is configured inside a VPC without outbound internet access, npm requests will fail. The solution is to either place the build environment in a public subnet with a NAT gateway or use a VPC endpoint for npm (e.g., Amazon S3 or AWS CodeArtifact) to allow outbound HTTPS traffic.
What should I do if I get this DVA-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.
About these practice questions
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Last reviewed: Jul 4, 2026
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