This CKS practice question tests your understanding of cluster setup and hardening. 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.
Which RBAC resource should be used to grant cluster-wide permissions to a user?
Role
Why wrong: Role is namespaced.
RoleBinding
Why wrong: RoleBinding grants permissions within a namespace.
ClusterRole
Why wrong: ClusterRole defines permissions but needs a binding to grant them.
ClusterRoleBinding
ClusterRoleBinding grants ClusterRole permissions cluster-wide.
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
ClusterRoleBinding is the correct resource because it binds a ClusterRole (which defines cluster-wide permissions) to a user, granting permissions across all namespaces. A ClusterRole itself only defines the rules; the binding is what actually grants those permissions to a specific subject. Therefore, to grant cluster-wide permissions to a user, you need a ClusterRoleBinding referencing a ClusterRole.
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 is namespaced.
RoleBinding
Why it's wrong here
RoleBinding grants permissions within a namespace.
ClusterRole
Why it's wrong here
ClusterRole defines permissions but needs a binding to grant them.
ClusterRoleBinding
Why this is correct
ClusterRoleBinding grants ClusterRole permissions cluster-wide.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse a ClusterRole (which only defines rules) with a ClusterRoleBinding (which actually grants those rules to a subject), leading them to select Option C instead of D.
Detailed technical explanation
Under the hood, RBAC in Kubernetes uses the `rbac.authorization.k8s.io/v1` API. A ClusterRoleBinding creates a binding between a subject (user, group, or ServiceAccount) and a ClusterRole, and the authorization webhook evaluates these bindings at request time. A real-world scenario is granting a cluster-admin user full access across all namespaces, which is typically done by binding the built-in `cluster-admin` ClusterRole to a user via a ClusterRoleBinding.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CKS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Cluster Setup and Hardening — This question tests Cluster Setup and Hardening — Read the scenario before looking for a memorised answer..
The correct answer is: ClusterRoleBinding — ClusterRoleBinding is the correct resource because it binds a ClusterRole (which defines cluster-wide permissions) to a user, granting permissions across all namespaces. A ClusterRole itself only defines the rules; the binding is what actually grants those permissions to a specific subject. Therefore, to grant cluster-wide permissions to a user, you need a ClusterRoleBinding referencing a ClusterRole.
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 CKS 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 CKS exam.
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