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 are reviewing RBAC permissions and notice a ClusterRoleBinding that binds the cluster-admin role to a service account in the 'monitoring' namespace. What is the best practice recommendation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Replace cluster-admin with a custom Role granting only necessary permissions
Option C is correct because the principle of least privilege dictates that a service account should only have the permissions necessary for its function. The cluster-admin role grants superuser access across the entire cluster, which is excessive for a monitoring service account. Replacing it with a custom Role that includes only the required API operations (e.g., get, list, watch on pods and nodes) reduces the attack surface and aligns with Kubernetes security best practices.
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.
✗
Keep the binding as it is required for monitoring
Why it's wrong here
Monitoring typically does not require full cluster-admin; use more restrictive roles.
✗
Delete the service account
Why it's wrong here
The service account may be needed; better to adjust its permissions.
✓
Replace cluster-admin with a custom Role granting only necessary permissions
Why this is correct
This follows least-privilege principle.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the binding to a RoleBinding in the monitoring namespace
Why it's wrong here
If the service account needs cluster-wide permissions, a ClusterRoleBinding may be appropriate, but cluster-admin is too broad.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that a RoleBinding can replace a ClusterRoleBinding for cluster-scoped tasks, but a RoleBinding cannot grant access to cluster-scoped resources like nodes or persistent volumes, so candidates must recognize when a ClusterRoleBinding is necessary even after reducing permissions.
Detailed technical explanation
How to think about this question
A ClusterRoleBinding grants permissions across all namespaces, while a RoleBinding is namespace-scoped. The cluster-admin role is defined by the Kubernetes API and includes verbs like '*' on all resources, including sensitive ones like secrets and nodes. For monitoring, a custom ClusterRole with specific verbs (e.g., get, list, watch) on resources like pods, nodes, and endpoints is sufficient, and binding it via a ClusterRoleBinding to the service account ensures the monitoring tool can function cluster-wide without excessive privileges.
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 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.
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: Replace cluster-admin with a custom Role granting only necessary permissions — Option C is correct because the principle of least privilege dictates that a service account should only have the permissions necessary for its function. The cluster-admin role grants superuser access across the entire cluster, which is excessive for a monitoring service account. Replacing it with a custom Role that includes only the required API operations (e.g., get, list, watch on pods and nodes) reduces the attack surface and aligns with Kubernetes security best practices.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.