KCNA Kubernetes Fundamentals Practice Question
Which control plane component is responsible for assigning pods to nodes?
⚠ Common exam trap
A common misconception is that kube-apiserver handles scheduling because it is the central API gateway, but the scheduler is a distinct component that runs the scheduling algorithm and communicates with the API server to bind pods to nodes.
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
✓
kube-scheduler
The kube-scheduler is the control plane component responsible for assigning pods to nodes. It watches for newly created pods that have no node assignment and selects an optimal node for each pod based on resource requirements, constraints, policies, and data locality. The scheduler does not actually run the pod; it updates the pod's `nodeName` field via the API server, which then triggers the kubelet on the chosen node to launch the pod.
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 it's wrong here
etcd stores cluster state but does not schedule pods.
- ✗
kube-apiserver
Why it's wrong here
The API server exposes the Kubernetes API and processes requests, but does not assign pods to nodes.
- ✓
kube-scheduler
Why this is correct
The kube-scheduler watches for newly created pods and assigns them to nodes.
- ✗
kube-controller-manager
Why it's wrong here
The controller manager runs controllers that perform reconciliation, but scheduling is done by the scheduler.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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