This CKS practice question tests your understanding of cluster setup and hardening. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 options are valid methods to secure etcd in a Kubernetes cluster?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable TLS with peer and client certificates
Option B is correct because enabling TLS with peer and client certificates encrypts all communication between etcd members and between etcd and the Kubernetes API server, preventing man-in-the-middle attacks and unauthorized access. This is a fundamental security requirement for etcd in production clusters, as etcd stores all cluster state and secrets.
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.
✗
Set --auto-compaction-mode=periodic
Why it's wrong here
Auto-compaction is for maintenance, not security.
✓
Enable TLS with peer and client certificates
Why this is correct
Encrypts communication and authenticates clients.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use a firewall to restrict access to etcd's port
Why this is correct
Network-level restriction adds security.
Related concept
Read the scenario before looking for a memorised answer.
✓
Encrypt secrets at rest using EncryptionConfiguration
Read the scenario before looking for a memorised answer.
✗
Enable RBAC authorization in etcd
Why it's wrong here
etcd RBAC is not commonly used in Kubernetes; TLS is preferred.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse etcd's maintenance features (like compaction) with security controls, or assume that Kubernetes RBAC extends to etcd, when in fact etcd has its own separate access control mechanisms.
Detailed technical explanation
How to think about this question
TLS for etcd involves separate peer certificates for inter-node communication and client certificates for API server connections, typically signed by a dedicated CA. In a real-world scenario, misconfigured TLS (e.g., using self-signed certificates without proper CN validation) can leave etcd vulnerable to spoofing attacks, even if encryption is enabled.
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 TLS with peer and client certificates — Option B is correct because enabling TLS with peer and client certificates encrypts all communication between etcd members and between etcd and the Kubernetes API server, preventing man-in-the-middle attacks and unauthorized access. This is a fundamental security requirement for etcd in production clusters, as etcd stores all cluster state and secrets.
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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