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 stores the entire cluster state?
kube-controller-manager
Why wrong: Controller manager runs controllers.
kube-scheduler
Why wrong: Scheduler assigns pods to nodes.
kube-apiserver
Why wrong: API server validates and serves API requests.
etcd
etcd stores 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
The correct answer is etcd because it is the distributed key-value store that serves as the single source of truth for the entire cluster state, including all objects, configurations, and secrets. The kube-apiserver is the only component that directly interacts with etcd, but it does not store the state itself—it reads from and writes to etcd on behalf of other components.
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.
kube-controller-manager
Why it's wrong here
Controller manager runs controllers.
kube-scheduler
Why it's wrong here
Scheduler assigns pods to nodes.
kube-apiserver
Why it's wrong here
API server validates and serves API requests.
etcd
Why this is correct
etcd stores cluster state.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the kube-apiserver as the storage layer because it is the only component that interacts with etcd, but the apiserver is merely a gateway and does not persist data itself.
Detailed technical explanation
etcd uses the Raft consensus algorithm to maintain a consistent, highly available replicated log across multiple nodes, ensuring that even if some etcd members fail, the cluster state remains intact. In production, etcd is typically deployed as a three- or five-node cluster, and the kube-apiserver communicates with it via the etcd v3 API using gRPC. A real-world scenario where this matters is during a disaster recovery: if etcd data is corrupted or lost, the entire cluster state is lost, and recovery requires restoring from a snapshot (e.g., using `etcdctl snapshot restore`).
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 — The correct answer is etcd because it is the distributed key-value store that serves as the single source of truth for the entire cluster state, including all objects, configurations, and secrets. The kube-apiserver is the only component that directly interacts with etcd, but it does not store the state itself—it reads from and writes to etcd on behalf of other components.
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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