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 THREE of the following are valid ways to secure etcd in a Kubernetes cluster? (Select THREE)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable encryption at rest for etcd data
Option B is correct because enabling encryption at rest for etcd data ensures that the stored Kubernetes secrets and cluster state are encrypted on disk using a provider like AES-CBC or AES-GCM. This protects sensitive data if the underlying storage is compromised, and is a required hardening step for compliance with standards like PCI-DSS or SOC 2.
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.
✗
Allow anonymous access to etcd for ease of management
Why it's wrong here
Anonymous access is insecure.
✓
Enable encryption at rest for etcd data
Why this is correct
Encryption at rest protects data if etcd storage is compromised.
Related concept
Read the scenario before looking for a memorised answer.
✗
Expose etcd on a public IP for external monitoring
Why it's wrong here
etcd should not be exposed publicly.
✓
Use etcd RBAC to restrict access to the etcd datastore
Why this is correct
etcd RBAC provides fine-grained access control.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable TLS client-to-server authentication
Why this is correct
TLS ensures secure communication and authentication.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'encryption at rest' with 'encryption in transit' (which is TLS), or mistakenly think that etcd RBAC (Option D) is not a valid security measure, when in fact etcd supports its own RBAC via `etcdctl` commands to restrict access to keys and users.
Detailed technical explanation
How to think about this question
etcd encryption at rest is configured via the `--encryption-provider-config` flag on the kube-apiserver, which points to a YAML file specifying resources (e.g., secrets) and encryption providers (e.g., aescbc, secretbox). The encryption key is stored in a local file or managed via KMS (e.g., AWS KMS, Azure Key Vault), and the provider must be rotated periodically to maintain security. A subtle behavior is that encryption at rest only applies to data written after the configuration is enabled; existing data must be re-encrypted manually using `kubectl get secrets --all-namespaces -o json | kubectl replace -f -`.
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 encryption at rest for etcd data — Option B is correct because enabling encryption at rest for etcd data ensures that the stored Kubernetes secrets and cluster state are encrypted on disk using a provider like AES-CBC or AES-GCM. This protects sensitive data if the underlying storage is compromised, and is a required hardening step for compliance with standards like PCI-DSS or SOC 2.
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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