KCNA Kubernetes Fundamentals Practice Question
Which control plane component is responsible for persisting the entire cluster state?
⚠ Common exam trap
A common trap is to think the kube-apiserver persists state because it is the central API gateway, but in reality, the API server is stateless and relies entirely on etcd for durable storage.
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 cluster state, including all objects (Pods, Services, ConfigMaps, etc.) and their desired and current status. The kube-apiserver is the only component that directly communicates with etcd, ensuring that all state changes are persisted durably and consistently. Without etcd, the cluster would have no record of its configuration or running workloads.
Answer analysis
Option-by-option breakdown
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
The controller manager runs controllers that regulate the cluster state, but the state is stored in etcd.
- ✓
etcd
Why this is correct
etcd is the distributed key-value store that stores all cluster data.
- ✗
kube-apiserver
Why it's wrong here
The API server is the entry point for all cluster operations, but it does not persist the state itself.
- ✗
kube-scheduler
Why it's wrong here
The scheduler assigns pods to nodes, but does not store cluster state.
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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.