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.
An etcd cluster uses TLS for peer and client communication. Which command correctly tests connectivity to an etcd member with client certificate authentication?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
etcdctl --endpoints=https://10.0.0.1:2379 --cacert=/etc/etcd/ca.crt --cert=/etc/etcd/etcd-client.crt --key=/etc/etcd/etcd-client.key endpoint health
Option B is correct because it provides all three required TLS components for mutual TLS (mTLS) authentication: the CA certificate (`--cacert`) to verify the server's identity, the client certificate (`--cert`) for the client's identity, and the client key (`--key`) to prove possession of the private key. The `endpoint health` command then performs a TLS handshake and checks the etcd member's health over HTTPS. Without any of these three, the connection will fail due to certificate validation errors or missing client authentication.
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.
✗
etcdctl --endpoints=https://10.0.0.1:2379 --cert=/etc/etcd/etcd-client.crt endpoint health
Why it's wrong here
Missing --key and --cacert flags.
✓
etcdctl --endpoints=https://10.0.0.1:2379 --cacert=/etc/etcd/ca.crt --cert=/etc/etcd/etcd-client.crt --key=/etc/etcd/etcd-client.key endpoint health
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that only the client certificate is needed for mTLS, causing candidates to forget the `--key` flag, or that only the CA certificate is sufficient for client authentication, leading them to omit the client certificate and key entirely.
Detailed technical explanation
How to think about this question
etcd's client TLS authentication follows the mTLS pattern defined in RFC 5246, where both parties present certificates. The `--cacert` flag points to the CA certificate used to sign the server's certificate, enabling the client to validate the server's identity. The `--cert` and `--key` flags provide the client's certificate and private key, which the server validates against its own trusted CA list. In production, etcd is often configured with `--client-cert-auth=true`, making client certificates mandatory; omitting any of these three flags will cause the connection to fail with a TLS error or a permission denied response.
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: etcdctl --endpoints=https://10.0.0.1:2379 --cacert=/etc/etcd/ca.crt --cert=/etc/etcd/etcd-client.crt --key=/etc/etcd/etcd-client.key endpoint health — Option B is correct because it provides all three required TLS components for mutual TLS (mTLS) authentication: the CA certificate (`--cacert`) to verify the server's identity, the client certificate (`--cert`) for the client's identity, and the client key (`--key`) to prove possession of the private key. The `endpoint health` command then performs a TLS handshake and checks the etcd member's health over HTTPS. Without any of these three, the connection will fail due to certificate validation errors or missing client authentication.
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.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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