KCNA Kubernetes Fundamentals Practice Question
Which component of the Kubernetes control plane stores the cluster state?
⚠ Common exam trap
A common mix-up: candidates confuse the kube-apiserver as the state store because it is the only component that interacts with etcd and serves the Kubernetes API, but the actual persistence layer is etcd itself.
Answer choices
Why each option matters
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 Kubernetes cluster. It stores all cluster state data, including configuration, secrets, and the desired state of every object (Pods, Deployments, Services, etc.). The kube-apiserver is the only component that directly communicates with etcd, ensuring that all state changes go through a consistent, versioned API.
Answer analysis
Option-by-option breakdown
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 control plane's distributed key-value store, persisting every Kubernetes object and cluster state. The API server is the only component that reads and writes it directly, making etcd the authoritative backing store for the cluster.
- ✗
kube-controller-manager
Why it's wrong here
kube-controller-manager runs reconciliation loops that drive actual cluster state toward the desired state; it reads and writes state through the API server rather than storing it. It is the correct component when the question asks which controller manages deployments, replica sets and node lifecycle.
- ✗
kube-scheduler
Why it's wrong here
kube-scheduler assigns pending pods to nodes by evaluating resource requests, affinity and taints; it records that decision via the API server and persists nothing itself. It is the correct component when the question asks which control-plane process selects a node for an unscheduled pod.
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kube-apiserver
Why it's wrong here
kube-apiserver exposes the Kubernetes API and is the only component that reads and writes etcd, but etcd itself holds the cluster state; the API server is the gateway, not the store. It is correct when asked which component validates and serves API requests.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA 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 KCNA exam.