KCNA Kubernetes Fundamentals Practice Question
Which component of the Kubernetes control plane is responsible for persisting the cluster state?
⚠ Common exam trap
It's easy for candidates to confuse the kube-apiserver as the storage backend, but it merely validates requests and writes to etcd. The etcd cluster is the actual persistent state store.
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 acts 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, ensuring consistency and durability. The kube-apiserver is the only component that directly interacts with etcd, enforcing a strict serialization of writes to prevent corruption.
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
The scheduler assigns pods to nodes, but does not store state.
- ✗
kube-controller-manager
Why it's wrong here
The controller manager runs controllers but does not store state.
- ✓
etcd
Why this is correct
etcd is the cluster's database, storing all cluster data.
- ✗
kube-apiserver
Why it's wrong here
The API server processes requests but does not persist state itself.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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