- A
Add a pre_build command to export AWS_DEFAULT_REGION using the AWS CLI.
Why wrong: The AWS CLI command to get the region would require the region to be set first, causing a circular dependency.
- B
Set the AWS_DEFAULT_REGION environment variable in the CodeBuild project's environment configuration.
Setting the environment variable in the project configuration ensures it is available during all build phases.
- C
Replace $AWS_DEFAULT_REGION with a hardcoded region like us-east-1.
Why wrong: Hardcoding the region reduces portability and is not a best practice; the issue is that the variable is not defined.
- D
Use the AWS_REGION environment variable instead of AWS_DEFAULT_REGION in the buildspec.
Why wrong: Although AWS_REGION is automatically set by CodeBuild, the buildspec likely uses $AWS_DEFAULT_REGION, which is not set. Changing to AWS_REGION would require modifying the buildspec, while setting AWS_DEFAULT_REGION in the project environment (option B) directly resolves the issue.
Resolving 'No region specified' Error in AWS CodeBuild by Setting AWS_DEFAULT_REGION
This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. A developer is using this buildspec.yml in AWS CodeBuild to build and push a Docker image to Amazon ECR. The build fails with the error: 'Error: No region specified'. Which change should the developer make to resolve this error?
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
Set the AWS_DEFAULT_REGION environment variable in the CodeBuild project's environment configuration.
The error occurs because the $AWS_DEFAULT_REGION environment variable is not set in the CodeBuild project. The developer must explicitly set the AWS_DEFAULT_REGION environment variable in the CodeBuild project configuration.
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.
- ✗
Add a pre_build command to export AWS_DEFAULT_REGION using the AWS CLI.
Why it's wrong here
The AWS CLI command to get the region would require the region to be set first, causing a circular dependency.
- ✓
Set the AWS_DEFAULT_REGION environment variable in the CodeBuild project's environment configuration.
Why this is correct
Setting the environment variable in the project configuration ensures it is available during all build phases.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Replace $AWS_DEFAULT_REGION with a hardcoded region like us-east-1.
Why it's wrong here
Hardcoding the region reduces portability and is not a best practice; the issue is that the variable is not defined.
- ✗
Use the AWS_REGION environment variable instead of AWS_DEFAULT_REGION in the buildspec.
Why it's wrong here
Although AWS_REGION is automatically set by CodeBuild, the buildspec likely uses $AWS_DEFAULT_REGION, which is not set. Changing to AWS_REGION would require modifying the buildspec, while setting AWS_DEFAULT_REGION in the project environment (option B) directly resolves the issue.
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.
Trap categories for this question
Command / output trap
The AWS CLI command to get the region would require the region to be set first, causing a circular dependency.
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
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.
Visual reference
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.
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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: Set the AWS_DEFAULT_REGION environment variable in the CodeBuild project's environment configuration. — The error occurs because the $AWS_DEFAULT_REGION environment variable is not set in the CodeBuild project. The developer must explicitly set the AWS_DEFAULT_REGION environment variable in the CodeBuild project configuration.
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.
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Last reviewed: Jul 4, 2026
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