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.
You have enabled etcd encryption at rest using an EncryptionConfiguration with aescbc provider. After applying the configuration, you create a new Secret. Which of the following is true regarding the encrypted Secret?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Only the new Secret is encrypted; existing Secrets remain in plaintext.
When you apply an EncryptionConfiguration with aescbc provider, only newly created Secrets are encrypted at rest. Existing Secrets remain in plaintext because encryption is applied at write time; the API server does not retroactively re-encrypt data already stored in etcd. This is why option C is correct.
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.
✗
All Secrets are encrypted because the EncryptionConfiguration applies to all resources.
Why it's wrong here
The configuration applies to new writes; existing data is not retroactively encrypted.
✗
All Secrets in the cluster, including existing ones, are immediately encrypted.
Why it's wrong here
Existing Secrets are not automatically encrypted; they need to be rotated or recreated.
✓
Only the new Secret is encrypted; existing Secrets remain in plaintext.
Why this is correct
Encryption applies to writes; existing data is not re-encrypted without manual intervention.
Related concept
Read the scenario before looking for a memorised answer.
✗
The new Secret is stored in plaintext because aescbc is not a valid provider.
Why it's wrong here
aescbc is a valid provider for encryption at rest.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume encryption is applied retroactively to all existing data, but Kubernetes only encrypts data at write time, so existing Secrets remain unencrypted until they are updated or re-created.
Detailed technical explanation
How to think about this question
Under the hood, the kube-apiserver uses the configured encryption provider (e.g., aescbc) to encrypt data before writing to etcd and decrypt it on read. The EncryptionConfiguration is loaded at API server startup; changes require restarting the kube-apiserver. A real-world scenario: after enabling encryption, operators must manually rotate existing Secrets (e.g., by re-creating them) to ensure all sensitive data is encrypted.
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: Only the new Secret is encrypted; existing Secrets remain in plaintext. — When you apply an EncryptionConfiguration with aescbc provider, only newly created Secrets are encrypted at rest. Existing Secrets remain in plaintext because encryption is applied at write time; the API server does not retroactively re-encrypt data already stored in etcd. This is why option C is correct.
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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