The answer is enabling dependency caching in the buildspec file. This is the most effective action to reduce AWS CodeBuild build time because it stores previously downloaded dependencies—such as Maven or Gradle artifacts—in a cache bucket, so subsequent builds reuse them instead of re-downloading everything from scratch, which is often the primary bottleneck in Java compilation. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of build optimization strategies, specifically how caching directly addresses timeout issues caused by slow dependency retrieval. A common trap is assuming that simply increasing compute resources (like larger instances) will always solve the problem, but caching attacks the root cause of repeated network I/O, making it more efficient than scaling up. Remember the memory tip: “Cache the fetch, not just the compute” to recall that dependency caching is the first-line fix for build timeouts.
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 is using AWS CodeBuild to compile a Java application. The build takes over 30 minutes, causing timeouts. The team has already increased the build timeout to the maximum. Which action would MOST effectively reduce the build time?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable dependency caching in the buildspec file.
Option C is correct because caching dependencies can significantly reduce build time by avoiding re-downloading. Option A is wrong because increasing compute resources can help but may not be as effective as caching. Option B is wrong because parallel builds may introduce complexity and dependencies. Option D is wrong because using a smaller instance would increase build time.
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.
✗
Use a smaller instance type to reduce provisioning time.
Why it's wrong here
Smaller instance would slow down the build.
✓
Enable dependency caching in the buildspec file.
Why this is correct
Caches downloaded dependencies across builds.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a larger compute type in CodeBuild.
Why it's wrong here
Increases compute resources but may not address dependency download time.
✗
Split the build into multiple parallel CodeBuild projects.
Why it's wrong here
May cause dependency issues and complexity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 dependency caching in the buildspec file. — Option C is correct because caching dependencies can significantly reduce build time by avoiding re-downloading. Option A is wrong because increasing compute resources can help but may not be as effective as caching. Option B is wrong because parallel builds may introduce complexity and dependencies. Option D is wrong because using a smaller instance would increase build time.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is using AWS CodeBuild to compile a Java application. The build takes over 30 minutes, which is too long. The project uses the standard build environment. The source code is stored in an S3 bucket. What is the most effective way to reduce build time?
hard
A.Use a custom build environment with pre-installed Java.
✓ B.Enable local caching for dependencies in the buildspec.yml.
C.Store the source code in AWS CodeCommit instead of S3.
D.Increase the compute type to a larger instance.
Why B: Option D is correct because caching the Maven dependencies can significantly reduce build time by reusing downloaded artifacts. Option A is wrong because it adds overhead. Option B is wrong because S3 is already the source. Option C is wrong because it does not address the compilation time.
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This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.
Question Discussion
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