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 is using AWS CodeBuild to build a Docker image and push it to Amazon ECR. The buildspec.yaml includes commands to build and tag the image. However, the push to ECR fails with an authentication error. Which TWO actions should the DevOps engineer take to resolve this?
Add a command in the buildspec to run 'aws ecr get-login-password --region <region> | docker login --username AWS --password-stdin <account>.dkr.ecr.<region>.amazonaws.com'.
This authenticates Docker to ECR.
C
Create an ECR lifecycle policy to expire untagged images.
Why wrong: Not related to authentication.
D
Ensure the CodeBuild service role has permissions for ecr:GetAuthorizationToken and ecr:Push.
IAM permissions are required.
E
Run 'docker login' with ECR credentials in the buildspec.
Why wrong: Docker login is not the standard for ECR.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a command in the buildspec to run 'aws ecr get-login-password --region <region> | docker login --username AWS --password-stdin <account>.dkr.ecr.<region>.amazonaws.com'.
Options B and D are correct. The CodeBuild project must have an IAM role with permissions to push to ECR, and the buildspec must include the 'aws ecr get-login-password' command to authenticate. Option A is wrong because Docker login is not needed. Option C is wrong because ECR does not require a public repository. Option E is wrong because ECR lifecycle policies are not related.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 ECR repository as public.
Why it's wrong here
Public repository is not needed.
✓
Add a command in the buildspec to run 'aws ecr get-login-password --region <region> | docker login --username AWS --password-stdin <account>.dkr.ecr.<region>.amazonaws.com'.
Why this is correct
This authenticates Docker to ECR.
Related concept
Authentication checks who the user is.
✗
Create an ECR lifecycle policy to expire untagged images.
Why it's wrong here
Not related to authentication.
✓
Ensure the CodeBuild service role has permissions for ecr:GetAuthorizationToken and ecr:Push.
Why this is correct
IAM permissions are required.
Related concept
Authentication checks who the user is.
✗
Run 'docker login' with ECR credentials in the buildspec.
Why it's wrong here
Docker login is not the standard for ECR.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DOP-C02 questions on access control and AAA configuration.
SDLC Automation — This question tests SDLC Automation — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Add a command in the buildspec to run 'aws ecr get-login-password --region <region> | docker login --username AWS --password-stdin <account>.dkr.ecr.<region>.amazonaws.com'. — Options B and D are correct. The CodeBuild project must have an IAM role with permissions to push to ECR, and the buildspec must include the 'aws ecr get-login-password' command to authenticate. Option A is wrong because Docker login is not needed. Option C is wrong because ECR does not require a public repository. Option E is wrong because ECR lifecycle policies are not related.
What should I do if I get this DOP-C02 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DOP-C02 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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