The correct approach is to configure the buildspec.yaml file to enable local caching and specify the paths to cache, because CodeBuild’s local caching mechanism stores reusable dependency directories in an S3 bucket, allowing subsequent builds to skip re-downloading unchanged packages and dramatically reduce build time. This works by setting the cache type to LOCAL in the build project and defining the cache paths in the buildspec under the cache section, which tells CodeBuild which directories to persist between builds. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of CodeBuild’s caching options and common misconfigurations—a frequent trap is assuming EFS or CodeCommit can serve as a cache layer, but CodeBuild only supports S3-backed local caching for dependency reuse. Remember the key distinction: local caching is S3-based, not filesystem-based, so think “S3 cache, not EFS.” A useful memory tip is “LOCAL means S3, not local disk”—the cache lives in S3 but is mounted locally during the build.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 run unit tests as part of a CI pipeline. The buildspec.yaml file is located in the root of the source repository. The build takes 30 minutes to complete. The team wants to speed up the build by caching dependencies. Which approach should they take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the buildspec.yaml to enable local caching and specify the paths to cache.
Option C is correct because CodeBuild supports local caching, which stores the cache in an S3 bucket and speeds up builds by reusing downloaded dependencies. Option A is wrong because CodeBuild does not directly support EFS for caching. Option B is wrong because CodeCommit does not provide caching. Option D is wrong because re-downloading dependencies defeats the purpose.
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.
✗
Download dependencies from the internet each time the build runs.
Why it's wrong here
This would not speed up the build; it would continue to take time downloading.
✗
Mount an Amazon EFS file system to the build container and store dependencies there.
Why it's wrong here
CodeBuild does not natively support EFS mounting; it's not a standard caching method.
✓
Configure the buildspec.yaml to enable local caching and specify the paths to cache.
Why this is correct
Local caching stores dependencies in S3 and reuses them across builds, reducing build time.
Related concept
Static NAT maps one inside address to one outside address.
✗
Store dependencies in an AWS CodeCommit repository and clone it during the build.
Why it's wrong here
Cloning a repository would add overhead, not reduce build time.
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.
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: Configure the buildspec.yaml to enable local caching and specify the paths to cache. — Option C is correct because CodeBuild supports local caching, which stores the cache in an S3 bucket and speeds up builds by reusing downloaded dependencies. Option A is wrong because CodeBuild does not directly support EFS for caching. Option B is wrong because CodeCommit does not provide caching. Option D is wrong because re-downloading dependencies defeats the purpose.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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