- A
Enable the local cache feature in CodeBuild.
Caching dependencies reduces download time.
- B
Store dependencies in Amazon Elastic File System (EFS) and mount it during builds.
Why wrong: EFS is slower than local cache.
- C
Increase the compute type of the build environment.
Why wrong: Faster compute does not address dependency downloads.
- D
Use multiple builds in parallel for the same commit.
Why wrong: Parallel builds do not speed up a single build.
Question 746 of 1,750
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 development team uses AWS CodeBuild to run unit tests on every commit to the develop branch. The tests take a long time because they download dependencies each time. What should the team do to reduce build time?
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
✓
Enable the local cache feature in CodeBuild.
Enabling the local cache feature in CodeBuild allows the build environment to cache dependencies, such as Maven or npm packages, in a local directory that persists across builds. This avoids re-downloading unchanged dependencies on every commit, significantly reducing build time. The cache can be stored in an S3 bucket or locally on the build instance, and is automatically restored at the start of each build.
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.
- ✓
Enable the local cache feature in CodeBuild.
Why this is correct
Caching dependencies reduces download time.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Store dependencies in Amazon Elastic File System (EFS) and mount it during builds.
Why it's wrong here
EFS is slower than local cache.
- ✗
Increase the compute type of the build environment.
Why it's wrong here
Faster compute does not address dependency downloads.
- ✗
Use multiple builds in parallel for the same commit.
Why it's wrong here
Parallel builds do not speed up a single build.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse caching with storage solutions like EFS or with scaling compute resources, failing to recognize that the core issue is repetitive network-bound dependency downloads, which only a cache mechanism can mitigate.
Detailed technical explanation
How to think about this question
CodeBuild local cache works by specifying a custom cache directory (e.g., /root/.m2 for Maven or /root/.npm for npm) in the buildspec file, which is then persisted across builds using Amazon S3 as the backend. Under the hood, CodeBuild compresses the cache directory and uploads it to S3 after a successful build, then downloads and extracts it before the next build. This is particularly effective for monorepos where dependency sets change infrequently, but note that cache invalidation must be handled manually or via build versioning to avoid stale artifacts.
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.
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.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable the local cache feature in CodeBuild. — Enabling the local cache feature in CodeBuild allows the build environment to cache dependencies, such as Maven or npm packages, in a local directory that persists across builds. This avoids re-downloading unchanged dependencies on every commit, significantly reducing build time. The cache can be stored in an S3 bucket or locally on the build instance, and is automatically restored at the start of each build.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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