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 THREE of the following are valid ways to restrict access to etcd? (Select 3)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable etcd RBAC to restrict read/write access
Option A is correct because etcd supports Role-Based Access Control (RBAC) that allows you to define roles and permissions to restrict read and write access to keys. By enabling etcd RBAC, you can enforce fine-grained authorization, ensuring that only authenticated and authorized clients (e.g., the Kubernetes API server) can perform specific operations on etcd data.
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.
✓
Enable etcd RBAC to restrict read/write access
Why this is correct
etcd RBAC can limit access to keys.
Related concept
Read the scenario before looking for a memorised answer.
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 disabling security features (like authentication or encryption) can simplify access control, but in reality, these features are essential for restricting access, and candidates may incorrectly think that network-level controls alone are insufficient or that HTTP is acceptable for internal traffic.
Detailed technical explanation
How to think about this question
etcd uses mutual TLS (mTLS) for client-server authentication, where both the server and client present certificates signed by a trusted CA. Firewall rules (Option D) operate at the network layer, restricting which IP addresses or ports can reach etcd, while TLS client certificates (Option E) provide cryptographic identity verification. In a production cluster, combining RBAC, TLS, and network policies creates defense-in-depth; for example, even if a pod is compromised, RBAC can prevent it from writing to critical etcd keys like /registry/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 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: Enable etcd RBAC to restrict read/write access — Option A is correct because etcd supports Role-Based Access Control (RBAC) that allows you to define roles and permissions to restrict read and write access to keys. By enabling etcd RBAC, you can enforce fine-grained authorization, ensuring that only authenticated and authorized clients (e.g., the Kubernetes API server) can perform specific operations on etcd data.
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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