DOP-C02 CodeBuild DOWNLOAD_SOURCE phase Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: codeBuild DOWNLOAD_SOURCE phase. 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.
Network Topology
The exhibit shows the output of the AWS CLI command 'batch-get-builds' for a CodeBuild build. The build failed. What is the most likely cause of the failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Network Topology
A
The source code has compilation errors.
Why wrong: Compilation errors occur in the BUILD phase.
B
The buildspec file is malformed.
Why wrong: A malformed buildspec would cause failure in the BUILD phase.
C
The build project does not have sufficient memory.
Why wrong: Memory issues would appear in the BUILD phase, not DOWNLOAD_SOURCE.
D
The S3 bucket 'my-bucket' does not exist or the build project lacks permissions to access it.
The DOWNLOAD_SOURCE phase failed, suggesting an issue with accessing the source artifact in S3.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The S3 bucket 'my-bucket' does not exist or the build project lacks permissions to access it.
The `batch-get-builds` output shows a failure in the DOWNLOAD_SOURCE phase, with an error indicating that the build could not access the S3 bucket `my-bucket`. The error details, such as 'Access Denied' or 'NoSuchBucket', imply that the CodeBuild service role lacks the required `s3:GetObject` permission on the bucket, or the bucket does not exist. This is a common misconfiguration when the source code is stored in an S3 bucket and the build project is not properly configured to retrieve it.
Key principle: CodeBuild DOWNLOAD_SOURCE phase
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The source code has compilation errors.
Why it's wrong here
Compilation errors occur in the BUILD phase.
✗
The buildspec file is malformed.
Why it's wrong here
A malformed buildspec would cause failure in the BUILD phase.
✗
The build project does not have sufficient memory.
Why it's wrong here
Memory issues would appear in the BUILD phase, not DOWNLOAD_SOURCE.
✓
The S3 bucket 'my-bucket' does not exist or the build project lacks permissions to access it.
Why this is correct
The DOWNLOAD_SOURCE phase failed, suggesting an issue with accessing the source artifact in S3.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CodeBuild DOWNLOAD_SOURCE phase
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a build failure is always due to code errors or buildspec issues, but the error message in the CLI output directly points to an S3 permission problem during the DOWNLOAD_SOURCE phase. Unlike artifact uploads which require s3:PutObject, source downloads require s3:GetObject, and candidates must distinguish between the two.
Detailed technical explanation
How to think about this question
CodeBuild uses an IAM service role to interact with AWS services. When the build project is configured to upload artifacts to S3, the role must have an IAM policy allowing `s3:PutObject` on the specific bucket and object path. The error in the exhibit is returned by the S3 API, not by the build process itself, which is why it appears as a `BUILD_FAILURE` phase with a descriptive message. In real-world scenarios, this often happens when the bucket is in a different AWS account or when the bucket policy explicitly denies the CodeBuild role.
KKey Concepts to Remember
CodeBuild DOWNLOAD_SOURCE phase
s3:GetObject permission
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
CodeBuild DOWNLOAD_SOURCE phase
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.
Review codeBuild DOWNLOAD_SOURCE phase, then practise related DOP-C02 questions on the same topic to reinforce the concept.
The correct answer is: The S3 bucket 'my-bucket' does not exist or the build project lacks permissions to access it. — The `batch-get-builds` output shows a failure in the DOWNLOAD_SOURCE phase, with an error indicating that the build could not access the S3 bucket `my-bucket`. The error details, such as 'Access Denied' or 'NoSuchBucket', imply that the CodeBuild service role lacks the required `s3:GetObject` permission on the bucket, or the bucket does not exist. This is a common misconfiguration when the source code is stored in an S3 bucket and the build project is not properly configured to retrieve it.
What should I do if I get this DOP-C02 question wrong?
Review codeBuild DOWNLOAD_SOURCE phase, then practise related DOP-C02 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CodeBuild DOWNLOAD_SOURCE phase
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