DOP-C02 Security and Compliance Practice Question
A company uses AWS CodeBuild to build and test code. The build jobs need to access a private S3 bucket to download dependencies. Which THREE steps are required to securely grant access?
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
✓
Configure the S3 bucket policy to allow access from the CodeBuild service principal
To grant CodeBuild access to an S3 bucket, you need an IAM role that allows the required actions, attach it to the CodeBuild project, and also ensure the bucket policy allows the role. KMS key is not required if SSE-S3 is used. VPC endpoint is optional.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the S3 bucket policy to allow access from the CodeBuild service principal
Why this is correct
The bucket policy must explicitly allow the role to access the bucket, unless the role has cross-account permissions.
- ✗
Set up a VPC endpoint for S3
Why it's wrong here
Not required for access; it's for network isolation.
- ✓
Create an IAM role with a policy that allows s3:GetObject on the bucket
Why this is correct
The role must have permission to read from the bucket.
- ✗
Create a KMS key and grant CodeBuild access to it
Why it's wrong here
Not required if the bucket uses SSE-S3 or no encryption.
- ✓
Attach the IAM role to the CodeBuild project in the service role field
Why this is correct
CodeBuild assumes this role when running builds.
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 |
Go deeper
Related to this question
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Same concept, more angles
1 more way this is tested on DOP-C02
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 DevOps engineer is troubleshooting a failed CodeBuild project. The build fails with an error: 'Access Denied: Unable to put object to S3.' The build project has an S3 bucket as the artifact store. What should the engineer do to resolve this issue?
medium- ✓ A.Add s3:PutObject permission to the CodeBuild service role for the artifact bucket.
- B.Enable server-side encryption on the artifact bucket.
- C.Enable CloudWatch Logs for the build project.
- D.Add s3:GetObject permission to the CodeBuild service role for the source bucket.
Why A: The CodeBuild service role requires the s3:PutObject permission on the artifact S3 bucket to upload build artifacts. Option B is incorrect because enabling server-side encryption does not grant write permissions; the issue is a missing IAM permission. Option C is incorrect because CloudWatch Logs are used for build logs, not for S3 access; enabling them does not resolve the access denied error. Option D is incorrect because s3:GetObject permission is for reading objects from a source bucket, not for writing artifacts. The error specifically indicates a failure to put an object into the artifact bucket, so the needed permission is s3:PutObject on that bucket.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.