This CKS practice question tests your understanding of cluster setup and hardening. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 ways to restrict access to etcd? (Select 2)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable RBAC on etcd by setting --auth-token=jwt and configuring roles.
Option A is correct because etcd supports Role-Based Access Control (RBAC) when you enable it with the `--auth-token=jwt` flag and then configure roles and users via `etcdctl`. This allows you to restrict which clients can read or write to the etcd key-value store, which is critical for securing Kubernetes cluster state. Without RBAC, any client that can reach the etcd port can access all secrets and configuration data.
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 RBAC on etcd by setting --auth-token=jwt and configuring roles.
Why this is correct
etcd supports RBAC with JWT tokens to restrict access.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use --peer-auto-tls=true to auto-generate certificates.
Why it's wrong here
Auto-tls is not recommended for production; it does not restrict access but rather simplifies certificate generation.
✗
Use --admission-control=NodeRestriction on etcd.
Why it's wrong here
NodeRestriction is an admission plugin for the API server, not etcd.
✓
Use TLS client certificates for authentication.
Why this is correct
TLS client certificates ensure only clients with valid certs can connect.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set --client-cert-auth=false to disable authentication.
Why it's wrong here
Disabling authentication is insecure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse etcd's `--client-cert-auth` flag (which enables TLS client certificate authentication) with the Kubernetes API server's `--admission-control` flag, or they assume that peer TLS options restrict client access.
Detailed technical explanation
How to think about this question
etcd's RBAC is implemented via the `etcd` API's `auth` package, which uses JSON Web Tokens (JWT) for authentication after initial role/user creation. The `--auth-token=jwt` flag enables token-based authentication, and you must then use `etcdctl role add` and `etcdctl user grant-role` to define permissions. A subtle behavior is that RBAC is only enforced after you explicitly enable it with `etcdctl auth enable`; until then, all clients have root access regardless of the flag.
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 RBAC on etcd by setting --auth-token=jwt and configuring roles. — Option A is correct because etcd supports Role-Based Access Control (RBAC) when you enable it with the `--auth-token=jwt` flag and then configure roles and users via `etcdctl`. This allows you to restrict which clients can read or write to the etcd key-value store, which is critical for securing Kubernetes cluster state. Without RBAC, any client that can reach the etcd port can access all secrets and configuration data.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This CKS practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKS exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.