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.
After setting up etcd encryption at rest using EncryptionConfiguration with aescbc, which resource stores the encryption key?
Why wrong: While a ConfigMap could be used to store the EncryptionConfiguration, the key itself is part of that configuration.
B
A Secret in the kube-system namespace
Why wrong: The encryption key is not stored as a Kubernetes Secret; it is provided in the EncryptionConfiguration file.
C
The EncryptionConfiguration file itself
The encryption key is defined in the EncryptionConfiguration YAML file under the 'keys' section. This file is passed to the API server via --encryption-provider-config.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The EncryptionConfiguration file itself
When etcd encryption at rest is configured via an EncryptionConfiguration file, the encryption key is defined within that file itself under the 'keys' field for the specified provider (e.g., aescbc). The EncryptionConfiguration file is passed to the kube-apiserver via the --encryption-provider-config flag, and the key material is read from this file at startup. No separate Secret or ConfigMap stores the key; the file is the authoritative source.
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.
✗
A ConfigMap in the etcd namespace
Why it's wrong here
While a ConfigMap could be used to store the EncryptionConfiguration, the key itself is part of that configuration.
✗
A Secret in the kube-system namespace
Why it's wrong here
The encryption key is not stored as a Kubernetes Secret; it is provided in the EncryptionConfiguration file.
✓
The EncryptionConfiguration file itself
Why this is correct
The encryption key is defined in the EncryptionConfiguration YAML file under the 'keys' section. This file is passed to the API server via --encryption-provider-config.
Related concept
Read the scenario before looking for a memorised answer.
✗
An annotation on the etcd pod
Why it's wrong here
The key is not stored in annotations.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume encryption keys must be stored in a Kubernetes Secret (like other secrets in kube-system), but the EncryptionConfiguration file itself is the sole storage for the key material, and it is not managed as a Kubernetes resource.
Detailed technical explanation
How to think about this question
The EncryptionConfiguration file supports multiple providers (aescbc, secretbox, aesgcm, kms) and each provider has a 'keys' list with a name and secret. The kube-apiserver reads this file on startup and caches the keys in memory; if the file changes, the apiserver must be restarted to pick up new keys. In real-world scenarios, this file is often stored on the control plane node's filesystem (e.g., /etc/kubernetes/enc/enc.yaml) and should be protected with strict file permissions (e.g., 600) to prevent unauthorized access.
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: The EncryptionConfiguration file itself — When etcd encryption at rest is configured via an EncryptionConfiguration file, the encryption key is defined within that file itself under the 'keys' field for the specified provider (e.g., aescbc). The EncryptionConfiguration file is passed to the kube-apiserver via the --encryption-provider-config flag, and the key material is read from this file at startup. No separate Secret or ConfigMap stores the key; the file is the authoritative source.
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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