This CKS practice question tests your understanding of cluster setup and hardening. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An administrator wants to secure etcd communication. Which of the following is required to enable TLS for client-to-etcd communication?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
--cert-file=<cert-file> and --key-file=<key-file>
To enable TLS for client-to-etcd communication, the etcd server must present a certificate to clients. The `--cert-file` and `--key-file` flags specify the server's TLS certificate and private key, which are required for the TLS handshake. Without these, etcd cannot serve HTTPS to clients.
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 ETCD_TLS_ENABLE=true environment variable
Why it's wrong here
etcd does not use environment variables for TLS; flags are required.
Read the scenario before looking for a memorised answer.
✗
--client-cert-auth=true and --trusted-ca-file=<CA-file>
Why it's wrong here
These flags enable client certificate authentication, but TLS itself requires --cert-file and --key-file.
✗
--tls-cert-file and --tls-key-file
Why it's wrong here
These are API server flags, not etcd flags.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the flags for enabling TLS (`--cert-file`/`--key-file`) with the flags for enabling client certificate authentication (`--client-cert-auth`/`--trusted-ca-file`), or they misremember the exact flag names as `--tls-cert-file`/`--tls-key-file` which do not exist in etcd.
Detailed technical explanation
How to think about this question
When etcd starts with `--cert-file` and `--key-file`, it binds an HTTPS listener on the client port (default 2379) using the provided certificate. The certificate must be valid for the hostname or IP used by clients; otherwise, clients will encounter TLS verification errors. In production, these flags are often combined with `--peer-cert-file` and `--peer-key-file` for securing inter-node communication.
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: --cert-file=<cert-file> and --key-file=<key-file> — To enable TLS for client-to-etcd communication, the etcd server must present a certificate to clients. The `--cert-file` and `--key-file` flags specify the server's TLS certificate and private key, which are required for the TLS handshake. Without these, etcd cannot serve HTTPS to clients.
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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