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 is the distributed key-value store holding cluster state; it persists scheduling decisions but never makes them. It would be correct if the question asked where the cluster's configuration and state data are stored, or which component the API server reads from.
- ✗
kube-apiserver
Why it's wrong here
The kube-apiserver exposes the API and validates requests, including binding objects, but it does not select nodes for pods. It would be the answer if the question asked which component authenticates requests and is the front end to the cluster's shared state.
- ✓
kube-scheduler
Why this is correct
kube-scheduler watches for newly created pods with no assigned node and selects a suitable node based on resource requests, affinity and taints. This satisfies the assignment responsibility, unlike kubelet, which only runs pods already bound to its node.
- ✗
kube-controller-manager
Why it's wrong here
The kube-controller-manager runs controllers such as node lifecycle and replication, which react to pod and node state rather than performing scheduling. It would be the answer if the question asked which component runs the reconciliation loops for deployments, ReplicaSets, and node monitoring.
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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.