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CKA study material · question 594 of 1000

What does binding the cluster-admin ClusterRole through a RoleBinding, rather than a ClusterRoleBinding, grant?

  1. Nothing; cluster-admin may only be used in a ClusterRoleBinding
  2. Read-only access across the cluster
  3. Full control of the binding's namespace, the namespace object included
  4. Full control of every namespace, but no cluster-scoped resources
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Answer: C. Full control of the binding's namespace, the namespace object included

cluster-admin in a ClusterRoleBinding is unrestricted; the same ClusterRole in a RoleBinding confines that power to one namespace, including the namespace object itself.

Source: Using RBAC Authorization (Kubernetes) — Default roles and role bindings › User-facing roles

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