This CKA practice question tests your understanding of cluster architecture, installation and 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.
Which control plane component is responsible for storing the cluster state and configuration?
etcd
etcd is the store for all cluster state and configuration.
kube-controller-manager
Why wrong: kube-controller-manager runs controllers but does not store state.
kube-apiserver
Why wrong: kube-apiserver exposes the Kubernetes API but does not store data.
kube-scheduler
Why wrong: kube-scheduler assigns pods to nodes but does not store cluster state.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
etcd
etcd is the distributed key-value store that serves as the single source of truth for the entire cluster, storing all cluster state data such as configurations, secrets, service endpoints, and resource specifications. The kube-apiserver reads from and writes to etcd exclusively, making it the only component that directly persists the cluster's desired and current state.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
etcd
Why this is correct
etcd is the store for all cluster state and configuration.
Related concept
Read the scenario before looking for a memorised answer.
kube-controller-manager
Why it's wrong here
kube-controller-manager runs controllers but does not store state.
kube-apiserver
Why it's wrong here
kube-apiserver exposes the Kubernetes API but does not store data.
kube-scheduler
Why it's wrong here
kube-scheduler assigns pods to nodes but does not store cluster state.
Common exam traps
The trap here is that candidates often confuse the kube-apiserver as the storage component because it is the primary interface for all cluster operations, but it is actually a stateless API gateway that relies entirely on etcd for persistence.
Detailed technical explanation
etcd uses the Raft consensus algorithm to maintain consistency across multiple replicas, ensuring that even if a leader fails, the cluster state remains reliable. In production, etcd is often deployed as a three- or five-node cluster on dedicated hosts to avoid resource contention, and its performance directly impacts the responsiveness of the entire control plane. The kube-apiserver communicates with etcd via the gRPC-based etcd v3 API, and all watch-based mechanisms (e.g., for controllers and schedulers) rely on etcd's ability to stream changes in real time.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: etcd — etcd is the distributed key-value store that serves as the single source of truth for the entire cluster, storing all cluster state data such as configurations, secrets, service endpoints, and resource specifications. The kube-apiserver reads from and writes to etcd exclusively, making it the only component that directly persists the cluster's desired and current state.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CKA 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 CKA exam.
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