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.
You need to create a ClusterRole that allows listing secrets, but only in namespaces that have a specific label 'security-level=high'. Which approach should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a ClusterRole and bind it with RoleBindings in each labeled namespace
Option A is correct because ClusterRoleBindings grant permissions cluster-wide, but RoleBindings can bind a ClusterRole to subjects within specific namespaces. By creating a ClusterRole with the necessary rules (e.g., 'list secrets') and then creating RoleBindings only in namespaces that have the label 'security-level=high', you effectively restrict the permission to those namespaces. This approach leverages the fact that a ClusterRole can be used with RoleBindings to scope permissions to individual namespaces.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Create a ClusterRole and bind it with RoleBindings in each labeled namespace
Why this is correct
ClusterRole can be used with RoleBindings to grant permissions only in selected namespaces.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a Role in each namespace, then aggregate them into a ClusterRole
Why it's wrong here
Aggregated ClusterRoles require labels on the ClusterRoles themselves, not roles.
✗
Create a ClusterRole and bind it with a ClusterRoleBinding; add a namespace condition in the role
Why it's wrong here
ClusterRoleBindings are cluster-scoped and cannot be limited to specific namespaces.
✗
Create a ClusterRole with a namespaceSelector: matchLabels: security-level: high
Why it's wrong here
ClusterRole does not support namespaceSelector.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse ClusterRoleBindings with RoleBindings, assuming a ClusterRole must always be bound with a ClusterRoleBinding, or they mistakenly think that a ClusterRole can include a namespace selector to limit its scope, which is not supported in Kubernetes RBAC.
Detailed technical explanation
How to think about this question
Under the hood, Kubernetes RBAC evaluates permissions by combining the Role/ClusterRole with the binding (RoleBinding or ClusterRoleBinding). A ClusterRole bound with a RoleBinding grants the permissions only in the namespace where the RoleBinding exists, effectively allowing namespace-scoped access without creating duplicate Roles. In real-world scenarios, this pattern is used to grant read-only access to secrets in high-security namespaces while preventing access in other namespaces, ensuring least privilege without managing multiple Role definitions.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
Cluster Setup and Hardening — This question tests Cluster Setup and Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a ClusterRole and bind it with RoleBindings in each labeled namespace — Option A is correct because ClusterRoleBindings grant permissions cluster-wide, but RoleBindings can bind a ClusterRole to subjects within specific namespaces. By creating a ClusterRole with the necessary rules (e.g., 'list secrets') and then creating RoleBindings only in namespaces that have the label 'security-level=high', you effectively restrict the permission to those namespaces. This approach leverages the fact that a ClusterRole can be used with RoleBindings to scope permissions to individual namespaces.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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