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.
Network Topology
Refer to the exhibit. A CodeBuild project uses this buildspec.yml to build and push a Docker image to Amazon ECR. The build fails at the pre_build phase with the error 'Error: Cannot perform an interactive login from a non TTY device'. What is the MOST likely issue?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The CodeBuild project's IAM role does not have permission to call ecr:GetAuthorizationToken.
Option C is correct because aws ecr get-login-password outputs the password to stdout, and docker login reads from stdin. The pipe (|) should work. However, the error indicates that docker login is trying interactive mode, which suggests that the command is not receiving the password correctly. But the real issue is that the ECR login command requires AWS credentials, and if the CodeBuild project does not have proper permissions to call ecr:GetAuthorizationToken, it will fail. Option A is not relevant because the error is about interactive login. Option B is not the cause. Option D is incorrect because the region is specified via environment variable.
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.
✗
The AWS_DEFAULT_REGION environment variable is not set in CodeBuild.
Why it's wrong here
The error message does not indicate a missing region.
✓
The CodeBuild project's IAM role does not have permission to call ecr:GetAuthorizationToken.
Why this is correct
This is a common cause; without this permission, the login command fails.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
The buildspec.yml is missing the 'docker login' command.
Why it's wrong here
It is present.
✗
The Docker daemon is not running on the CodeBuild instance.
Why it's wrong here
The error is about interactive login, not Docker daemon.
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: The CodeBuild project's IAM role does not have permission to call ecr:GetAuthorizationToken. — Option C is correct because aws ecr get-login-password outputs the password to stdout, and docker login reads from stdin. The pipe (|) should work. However, the error indicates that docker login is trying interactive mode, which suggests that the command is not receiving the password correctly. But the real issue is that the ECR login command requires AWS credentials, and if the CodeBuild project does not have proper permissions to call ecr:GetAuthorizationToken, it will fail. Option A is not relevant because the error is about interactive login. Option B is not the cause. Option D is incorrect because the region is specified via environment variable.
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.
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?
Authentication checks who the user is.
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