CKA Practice Question: Cluster Architecture, Installation & Configuration
This CKA practice question tests your understanding of cluster architecture, installation & configuration. 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.
A team is configuring etcd for a multi-node Kubernetes cluster. They want to ensure that etcd data is encrypted at rest. Which approach should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an EncryptionConfiguration resource specifying a provider like 'aescbc' and configure the kube-apiserver with --encryption-provider-config.
Option B is correct because Kubernetes supports encrypting secrets and other resources at rest via an EncryptionConfiguration object, which is passed to the kube-apiserver using the --encryption-provider-config flag. This mechanism encrypts data before it is written to etcd, ensuring that even if the etcd storage is compromised, the data remains unreadable without the encryption key.
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.
✗
Use LUKS to encrypt the disk partition where etcd data is stored.
Why it's wrong here
This is a valid approach but not Kubernetes-native; also requires manual management.
✓
Create an EncryptionConfiguration resource specifying a provider like 'aescbc' and configure the kube-apiserver with --encryption-provider-config.
Why this is correct
This is the standard Kubernetes method for encrypting secrets at rest.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use TLS certificates to encrypt communication between etcd and the API server.
Configure etcd to use encryption at rest by setting --experimental-encryption-provider.
Why it's wrong here
etcd does not have such a flag; encryption is handled by Kubernetes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing encryption at rest (data on disk) with encryption in transit (TLS), leading candidates to select TLS-based options, or assuming that etcd itself handles encryption at rest when it is actually the kube-apiserver that performs the encryption before writing to etcd.
Detailed technical explanation
How to think about this question
The EncryptionConfiguration resource allows you to define multiple encryption providers (e.g., aescbc, secretbox, kms) with key rotation and precedence. When the kube-apiserver writes data to etcd, it encrypts the resource using the first provider in the list, and on read, it tries each provider until decryption succeeds. This design enables seamless key rotation and supports external KMS providers for enterprise key management.
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 CKA 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 CKA question in full detail.
Cluster Architecture, Installation & Configuration — This question tests Cluster Architecture, Installation & Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an EncryptionConfiguration resource specifying a provider like 'aescbc' and configure the kube-apiserver with --encryption-provider-config. — Option B is correct because Kubernetes supports encrypting secrets and other resources at rest via an EncryptionConfiguration object, which is passed to the kube-apiserver using the --encryption-provider-config flag. This mechanism encrypts data before it is written to etcd, ensuring that even if the etcd storage is compromised, the data remains unreadable without the encryption key.
What should I do if I get this CKA 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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