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. An IAM policy is attached to a CodeBuild service role. The CodeBuild project is used to build code from a CodeCommit repository and output artifacts to an S3 bucket. However, the build fails with an error: 'Unable to download source from CodeCommit'. What is the missing permission?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Permissions to read from the CodeCommit repository.
The error 'Unable to download source from CodeCommit' indicates that the CodeBuild service role lacks the necessary permissions to read the source code from the CodeCommit repository. CodeBuild uses the service role to interact with CodeCommit via Git, which requires the `codecommit:GitPull` action (or broader read permissions like `codecommit:Get*` and `codecommit:List*`). Without these permissions, the build process cannot clone or fetch the source code, causing the failure.
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.
✓
Permissions to read from the CodeCommit repository.
Why this is correct
The policy lacks CodeCommit actions like codecommit:GitPull.
Related concept
Read the scenario before looking for a memorised answer.
✗
Permissions to create CloudWatch Logs for build output.
Why it's wrong here
Logs permissions are not needed for source download.
✗
Permissions to decrypt the KMS key used to encrypt artifacts.
Why it's wrong here
No encryption key is mentioned.
✗
Permissions to write to the S3 artifact bucket.
Why it's wrong here
S3 PutObject is already allowed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the source download phase with the artifact upload phase, assuming the error is about S3 write permissions or KMS decryption, when the error message explicitly identifies the source download as the failing step.
Detailed technical explanation
How to think about this question
CodeBuild uses Git over HTTPS to connect to CodeCommit, and the service role must have an IAM policy that allows `codecommit:GitPull` on the specific repository ARN. Under the hood, CodeBuild generates a temporary Git credential using the service role's AWS credentials, and if the role lacks the `codecommit:GitPull` permission, the Git clone operation fails with an HTTP 403 error, which CodeBuild surfaces as 'Unable to download source from CodeCommit'. This is distinct from S3 or KMS permissions, which are evaluated later in the build pipeline.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Permissions to read from the CodeCommit repository. — The error 'Unable to download source from CodeCommit' indicates that the CodeBuild service role lacks the necessary permissions to read the source code from the CodeCommit repository. CodeBuild uses the service role to interact with CodeCommit via Git, which requires the `codecommit:GitPull` action (or broader read permissions like `codecommit:Get*` and `codecommit:List*`). Without these permissions, the build process cannot clone or fetch the source code, causing the failure.
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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Question Discussion
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