This DOP-C02 practice question tests your understanding of security and compliance. 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 DevOps engineer is troubleshooting a failed AWS CodeBuild project. The build fails with an error indicating that the IAM role does not have permission to describe Amazon ECR repositories. The role used by CodeBuild has the following policy attached: {"Version":"2012-10-17","Statement":[{"Effect":"Allow","Action":["ecr:GetAuthorizationToken","ecr:BatchCheckLayerAvailability","ecr:GetDownloadUrlForLayer","ecr:BatchGetImage"],"Resource":"*"}]}. What is the missing permission?
ecr:InitiateLayerUpload
Why wrong: This is for uploading layers, not describing.
ecr:GetRepositoryPolicy
Why wrong: This is a different action not needed for describing repositories.
ecr:ListImages
Why wrong: ListImages is not the same as describe repositories.
ecr:DescribeRepositories
The policy lacks the DescribeRepositories permission, which is required to list and describe repositories.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ecr:DescribeRepositories
The policy allows several ECR actions but does not include 'ecr:DescribeRepositories'. The error specifically mentions 'describe' which is that action. The other actions are present.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
ecr:InitiateLayerUpload
Why it's wrong here
This is for uploading layers, not describing.
ecr:GetRepositoryPolicy
Why it's wrong here
This is a different action not needed for describing repositories.
ecr:ListImages
Why it's wrong here
ListImages is not the same as describe repositories.
ecr:DescribeRepositories
Why this is correct
The policy lacks the DescribeRepositories permission, which is required to list and describe repositories.
Related concept
Authentication checks who the user is.
Common exam traps
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
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.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
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
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.
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FAQ
Security and Compliance — This question tests Security and Compliance — Authentication checks who the user is..
The correct answer is: ecr:DescribeRepositories — The policy allows several ECR actions but does not include 'ecr:DescribeRepositories'. The error specifically mentions 'describe' which is that action. The other actions are present.
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.
Authentication checks who the user is.
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Last reviewed: Jun 20, 2026
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.
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