The answer is that the Maven dependencies are not being stored in the local repository path specified in the cache. Even though CodeBuild correctly downloads and uploads the S3 cache, if the Maven build process is configured to use a different local repository path—such as a custom `.m2` directory or a project-specific repository—the cached files at `/root/.m2` will remain empty or irrelevant, forcing Maven to re-download all dependencies from the internet each time. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how CodeBuild caching works at the filesystem level, not just the S3 configuration; a common trap is assuming that enabling S3 cache alone solves build speed issues without verifying that the build tool’s output path matches the cache path. Remember the mnemonic: “Cache path must match the tool’s stash”—if Maven isn’t writing to `/root/.m2`, your S3 cache is just storing empty promises.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 CodeBuild to compile and test their Java application. The build takes about 20 minutes. They have enabled Amazon S3 cache to store the Maven repository to speed up subsequent builds. However, they notice that the build time has not improved significantly. The buildspec file includes the 'cache' section with 'paths' pointing to '/root/.m2'. The CodeBuild project has cache type set to 'S3' and a valid bucket. The build logs show that the cache is being downloaded and uploaded, but the Maven dependencies are still being downloaded from the internet each time. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Maven dependencies are not being stored in the local repository path specified in the cache.
Option C is correct because if the Maven local repository is not configured to store dependencies, the cache will not help. The build might be using a different repository or the dependencies are not cached properly. Option A is wrong because the cache bucket is configured. Option B is wrong because the cache is being used. Option D is wrong because the paths are correct.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 cache is too large and takes as long to download as the build itself.
Why it's wrong here
The logs show cache is being downloaded, but dependencies are still downloaded from internet, indicating cache is not effective.
✗
The S3 bucket is in a different region than the CodeBuild project.
Why it's wrong here
Cross-region caching works, but latency may increase; however, cache would still be used.
✗
The buildspec file does not include the 'cache' section correctly.
Why it's wrong here
The problem states the cache section is included.
✓
The Maven dependencies are not being stored in the local repository path specified in the cache.
Why this is correct
If Maven is configured to download dependencies to a different location, the cache won't capture them.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
The logs show cache is being downloaded, but dependencies are still downloaded from internet, indicating cache is not effective.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
SDLC Automation — This question tests SDLC Automation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The Maven dependencies are not being stored in the local repository path specified in the cache. — Option C is correct because if the Maven local repository is not configured to store dependencies, the cache will not help. The build might be using a different repository or the dependencies are not cached properly. Option A is wrong because the cache bucket is configured. Option B is wrong because the cache is being used. Option D is wrong because the paths are correct.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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