This CKS practice question tests your understanding of cluster setup. 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 TWO of the following are valid methods to secure the etcd cluster in a Kubernetes setup?
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 certificates for etcd member communication
Option C is correct because etcd uses the Raft consensus protocol for distributed coordination, and enabling TLS with peer certificates ensures that all communication between etcd members (nodes) is encrypted and authenticated. This prevents man-in-the-middle attacks and unauthorized nodes from joining the cluster, which is a core security requirement for the control plane's data store.
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 encryption at rest for etcd data
Why it's wrong here
Encryption at rest is for etcd data, but the question asks for securing the cluster, not data at rest.
✗
Configure RBAC on etcd
Why it's wrong here
etcd does not have RBAC; it uses TLS authentication.
✓
Enable TLS with peer certificates for etcd member communication
Read the scenario before looking for a memorised answer.
✓
Enable TLS with client certificates for etcd client communication
Why this is correct
Client certificates secure communication between API server and etcd.
Related concept
Read the scenario before looking for a memorised answer.
✗
Apply NetworkPolicies to etcd pods
Why it's wrong here
NetworkPolicies are for Kubernetes pods, but etcd may run outside Kubernetes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between securing the etcd cluster itself (via TLS for communication) versus securing the data at rest or using Kubernetes-level controls like RBAC or NetworkPolicies, which do not apply to the etcd process running outside the pod network.
Detailed technical explanation
How to think about this question
When securing etcd, you must configure both peer TLS (for inter-member communication) and client TLS (for communication between etcd and the Kubernetes API server). The peer certificates are used for mutual TLS (mTLS) between etcd nodes, ensuring that only nodes with valid certificates can participate in the Raft cluster. A common misconfiguration is using the same certificate for both peer and client roles, which violates the principle of least privilege and can lead to unauthorized access if a client certificate is compromised.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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 — This question tests Cluster Setup — 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 certificates for etcd member communication — Option C is correct because etcd uses the Raft consensus protocol for distributed coordination, and enabling TLS with peer certificates ensures that all communication between etcd members (nodes) is encrypted and authenticated. This prevents man-in-the-middle attacks and unauthorized nodes from joining the cluster, which is a core security requirement for the control plane's data store.
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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