Quick Answer
The answer is CODEBUILD_BUILD_ID and CODEBUILD_SRC_DIR. These two environment variables are automatically injected by AWS CodeBuild into every build environment, meaning they are available in your build commands without any manual configuration. CODEBUILD_BUILD_ID uniquely identifies the build execution, while CODEBUILD_SRC_DIR provides the absolute path to the source code directory. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of CodeBuild’s built-in environment variables versus those that must be explicitly defined or are inherited from the AWS CLI. A common trap is confusing AWS_REGION, which is automatically set by the AWS CLI but is not a CodeBuild-specific variable, with the truly automatic CodeBuild variables. Another trap is assuming CODEBUILD_BUILD_NUMBER is automatically set—it is actually exposed only when you explicitly define it in your project. For a quick memory tip: think of the two automatic variables as the build’s ID card and its home directory.
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. The buildspec.yaml file includes commands to install dependencies and run tests. Which TWO environment variables are automatically set by CodeBuild and can be used in the build commands? (Choose TWO.)
CODEBUILD_SRC_DIR
This is automatically set to the source directory.
AWS_REGION
Why wrong: AWS_REGION is automatically set by the AWS CLI, but not specifically by CodeBuild.
CODEBUILD_BUILD_ID
This is automatically set to the build ID.
CODEBUILD_BUILD_NUMBER
Why wrong: This is not automatically set; it is a user-defined variable.
CI
Why wrong: CI is not automatically set by CodeBuild.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
CODEBUILD_SRC_DIR
Options B and D are correct. CODEBUILD_BUILD_ID and CODEBUILD_SRC_DIR are automatically set by CodeBuild. Option A is wrong because AWS_REGION is automatically set, but it is an AWS CLI environment variable, not specific to CodeBuild. Option C is wrong because CODEBUILD_BUILD_NUMBER is not an automatic environment variable; it is exposed but not automatically set. Option E is wrong because CI is not automatically set by CodeBuild.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
CODEBUILD_SRC_DIR
Why this is correct
This is automatically set to the source directory.
Related concept
Read the scenario before looking for a memorised answer.
AWS_REGION
Why it's wrong here
AWS_REGION is automatically set by the AWS CLI, but not specifically by CodeBuild.
CODEBUILD_BUILD_ID
Why this is correct
This is automatically set to the build ID.
Related concept
Read the scenario before looking for a memorised answer.
CODEBUILD_BUILD_NUMBER
Why it's wrong here
This is not automatically set; it is a user-defined variable.
CI
Why it's wrong here
CI is not automatically set by CodeBuild.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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.
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FAQ
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
The correct answer is: CODEBUILD_SRC_DIR — Options B and D are correct. CODEBUILD_BUILD_ID and CODEBUILD_SRC_DIR are automatically set by CodeBuild. Option A is wrong because AWS_REGION is automatically set, but it is an AWS CLI environment variable, not specific to CodeBuild. Option C is wrong because CODEBUILD_BUILD_NUMBER is not an automatic environment variable; it is exposed but not automatically set. Option E is wrong because CI is not automatically set by CodeBuild.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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.
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