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 TWO of the following are valid methods to secure the etcd datastore 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 encryption for client-to-server communication.
Option A is correct because enabling TLS encryption for client-to-server communication ensures that all data transmitted between etcd clients (such as the Kubernetes API server) and the etcd server is encrypted, preventing eavesdropping and man-in-the-middle attacks. This is a fundamental security measure for protecting sensitive cluster state and secrets stored in etcd.
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 TLS encryption for client-to-server communication.
Why this is correct
TLS encrypts data in transit between etcd and clients.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable peer authentication using TLS certificates.
Why this is correct
Peer authentication ensures only trusted etcd members join the cluster.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use HTTP instead of HTTPS for better performance.
Why it's wrong here
HTTP does not encrypt traffic, compromising security.
✗
Disable client authentication to simplify configuration.
Expose the etcd port (2379) on a public IP for easier monitoring.
Why it's wrong here
Exposing etcd to public networks increases attack surface.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think enabling TLS for client-to-server communication is optional or that peer authentication is not required, but the CKS exam emphasizes that both client and peer TLS are mandatory for securing etcd in a hardened cluster.
Detailed technical explanation
How to think about this question
etcd uses mutual TLS (mTLS) for both client-to-server and peer-to-peer communication, where each party presents a certificate signed by a trusted CA. The `--client-cert-auth` flag on the etcd server enforces client certificate verification, and the `--trusted-ca-file` specifies the CA certificate chain. In production, it is common to use separate CA certificates for client and peer authentication to limit the blast radius of a compromised certificate.
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: Enable TLS encryption for client-to-server communication. — Option A is correct because enabling TLS encryption for client-to-server communication ensures that all data transmitted between etcd clients (such as the Kubernetes API server) and the etcd server is encrypted, preventing eavesdropping and man-in-the-middle attacks. This is a fundamental security measure for protecting sensitive cluster state and secrets stored in etcd.
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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