This CKS practice question tests your understanding of cluster setup and hardening. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 THREE of the following are valid methods to secure etcd in a Kubernetes cluster? (Select THREE)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use RBAC to restrict access to etcd.
RBAC is a valid method to secure etcd because etcd supports role-based access control for its API, allowing you to define roles and permissions that restrict which users or processes can read or write keys. By enabling RBAC on etcd, you can limit access to sensitive cluster data, such as secrets and configuration, to only authorized components like the Kubernetes API server.
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.
✗
Apply a NetworkPolicy to block traffic to etcd pods.
Why it's wrong here
NetworkPolicies apply to pods, not to etcd running as a static pod or systemd service; also etcd may not be a pod.
✓
Use RBAC to restrict access to etcd.
Why this is correct
RBAC can limit which users/service accounts can access etcd via the API server.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable TLS peer and client authentication.
Why this is correct
TLS ensures encrypted communication and mutual authentication.
Related concept
Read the scenario before looking for a memorised answer.
✗
Expose the etcd client port (2379) to the public internet for monitoring.
Why it's wrong here
Exposing etcd publicly is insecure; it should be internal.
✓
Set file permissions on etcd data directory to 700.
Why this is correct
Restricts access to the etcd user only.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that NetworkPolicy can secure etcd, but candidates forget that etcd may not be a regular pod subject to NetworkPolicy, or that NetworkPolicy only controls pod-to-pod traffic and not external access to the etcd port.
Detailed technical explanation
How to think about this question
etcd's RBAC model uses roles and users, where each role is granted access to specific key prefixes (e.g., /registry/) via read and write permissions. In production, you should enable TLS for all communication and then layer RBAC to enforce fine-grained access control, ensuring that only the API server has write access to the /registry/ prefix while other components have read-only or no access. A real-world scenario is when a misconfigured monitoring tool is given full read access to etcd, potentially exposing all cluster secrets.
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: Use RBAC to restrict access to etcd. — RBAC is a valid method to secure etcd because etcd supports role-based access control for its API, allowing you to define roles and permissions that restrict which users or processes can read or write keys. By enabling RBAC on etcd, you can limit access to sensitive cluster data, such as secrets and configuration, to only authorized components like the Kubernetes API server.
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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