- A
Change the ECR repository policy to allow public access.
Why wrong: Public access defeats security purposes.
- B
Remove the VPC configuration from the CodeBuild project so it can access the public internet.
Why wrong: Removing VPC might expose the build environment and is not recommended.
- C
Add 'ecr:GetDownloadUrlForLayer' and 'ecr:BatchGetImage' permissions to the CodeBuild service role.
These permissions are required to pull images from ECR.
- D
Grant 'kms:Decrypt' permissions for the KMS key used by ECR.
Why wrong: KMS permissions are needed only if encryption is enabled, but the primary issue is access.
- E
Create a VPC endpoint for Amazon ECR and associate it with the VPC used by CodeBuild.
VPC endpoints allow private connectivity to ECR.
Question 1,209 of 1,750
DOP-C02 SDLC Automation Practice Question
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.
A company uses AWS CodeBuild to run security scans on code. The scan requires access to a private Amazon ECR repository for downloading scanning tools. The CodeBuild project is configured with a VPC and uses an IAM role. However, the build fails with 'Error: unable to pull image from registry.' Which TWO steps should be taken to resolve this?
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
✓
Add 'ecr:GetDownloadUrlForLayer' and 'ecr:BatchGetImage' permissions to the CodeBuild service role.
Option C is correct because the CodeBuild service role must have the 'ecr:GetDownloadUrlForLayer' and 'ecr:BatchGetImage' permissions to authorize the retrieval of container image layers from the private ECR repository. Without these permissions, the Docker pull operation fails with 'unable to pull image from registry' even if network connectivity is established.
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.
- ✗
Change the ECR repository policy to allow public access.
Why it's wrong here
Public access defeats security purposes.
- ✗
Remove the VPC configuration from the CodeBuild project so it can access the public internet.
Why it's wrong here
Removing VPC might expose the build environment and is not recommended.
- ✓
Add 'ecr:GetDownloadUrlForLayer' and 'ecr:BatchGetImage' permissions to the CodeBuild service role.
Why this is correct
These permissions are required to pull images from ECR.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Grant 'kms:Decrypt' permissions for the KMS key used by ECR.
Why it's wrong here
KMS permissions are needed only if encryption is enabled, but the primary issue is access.
- ✓
Create a VPC endpoint for Amazon ECR and associate it with the VPC used by CodeBuild.
Why this is correct
VPC endpoints allow private connectivity to ECR.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus solely on IAM permissions (Option C) and overlook the VPC endpoint requirement (Option E), or they incorrectly assume removing the VPC (Option B) is the fix, not realizing that VPC endpoints are the correct way to provide private connectivity to ECR.
Detailed technical explanation
How to think about this question
When CodeBuild runs in a VPC, it cannot reach public AWS service endpoints (including ECR) unless VPC endpoints are created. The ECR VPC endpoint (com.amazonaws.<region>.ecr.dkr) uses AWS PrivateLink to route Docker pull requests privately, avoiding NAT/internet dependency. Additionally, the Docker client uses the ECR authorization token (obtained via ecr:GetAuthorizationToken) and then calls ecr:BatchGetImage and ecr:GetDownloadUrlForLayer to fetch image manifests and layers; missing either permission causes the pull to fail.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
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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: Add 'ecr:GetDownloadUrlForLayer' and 'ecr:BatchGetImage' permissions to the CodeBuild service role. — Option C is correct because the CodeBuild service role must have the 'ecr:GetDownloadUrlForLayer' and 'ecr:BatchGetImage' permissions to authorize the retrieval of container image layers from the private ECR repository. Without these permissions, the Docker pull operation fails with 'unable to pull image from registry' even if network connectivity is established.
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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Last reviewed: Jul 4, 2026
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