This CKA practice question tests your understanding of cluster architecture, installation and configuration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 ClusterRole named 'pod-reader' grants get, list, watch on pods. You want to bind it to a user 'john' cluster-wide. Which resource should you create?
Role
Why wrong: Role defines permissions, not binding.
ClusterRoleBinding
Correct for cluster-wide binding.
RoleBinding in default namespace
Why wrong: Only grants permissions in one namespace.
ClusterRole
Why wrong: Already exists.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ClusterRoleBinding
A ClusterRoleBinding is the correct resource because it grants cluster-wide permissions to a user. While a ClusterRole defines the permissions (get, list, watch on pods), a ClusterRoleBinding binds that ClusterRole to a subject (user 'john') across all namespaces. This is the only way to achieve cluster-scoped authorization in Kubernetes RBAC.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Role
Why it's wrong here
Role defines permissions, not binding.
ClusterRoleBinding
Why this is correct
Correct for cluster-wide binding.
Related concept
Read the scenario before looking for a memorised answer.
RoleBinding in default namespace
Why it's wrong here
Only grants permissions in one namespace.
ClusterRole
Why it's wrong here
Already exists.
Common exam traps
The trap here is that candidates often confuse ClusterRole (which defines permissions) with ClusterRoleBinding (which binds them to a user), or mistakenly think a RoleBinding can grant cluster-wide access if used with a ClusterRole.
Detailed technical explanation
Under the hood, Kubernetes RBAC uses the SubjectAccessReview API to evaluate authorization requests. A ClusterRoleBinding creates a binding that is evaluated by the RBAC authorizer for all API requests, regardless of namespace. In real-world scenarios, cluster-wide permissions are essential for monitoring tools (e.g., Prometheus) or cluster administrators who need to view resources across all namespaces without being restricted to a single namespace.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
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FAQ
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: ClusterRoleBinding — A ClusterRoleBinding is the correct resource because it grants cluster-wide permissions to a user. While a ClusterRole defines the permissions (get, list, watch on pods), a ClusterRoleBinding binds that ClusterRole to a subject (user 'john') across all namespaces. This is the only way to achieve cluster-scoped authorization in Kubernetes RBAC.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CKA practice question is part of Courseiva's free CNCF 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 CKA exam.
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