KCNA Kubernetes Fundamentals Practice Question
Which Kubernetes component is responsible for storing the cluster state?
⚠ Common exam trap
CNCF often tests the misconception that kube-apiserver stores the cluster state because it is the central API gateway, but the trap is that kube-apiserver only mediates access while etcd is the actual persistent storage layer.
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 a distributed, consistent key-value store used by Kubernetes to store all cluster data, including configuration, state, and metadata. It is the single source of truth for the cluster; without etcd, the cluster cannot maintain or recover its state. The kube-apiserver is the only component that communicates directly with etcd, but it is etcd itself that physically stores the data.
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-scheduler
Why it's wrong here
Scheduler assigns pods to nodes; it does not store state.
- ✗
kube-apiserver
Why it's wrong here
API server is the front-end for the Kubernetes control plane; it does not store state.
- ✓
etcd
Why this is correct
etcd stores all cluster state, including configurations and desired state.
- ✗
kube-controller-manager
Why it's wrong here
Controller manager runs controllers; it reads/writes to etcd via API server, but does not store state.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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