KCNA Kubernetes Fundamentals Practice Question
Which component runs on every worker node and ensures that containers are running in a Pod as specified in the Pod manifest?
⚠ Common exam trap
It's easy for candidates to confuse the container runtime with the kubelet, thinking the runtime directly reads Pod manifests, when in fact the kubelet is the orchestrator that interprets the manifest and delegates container operations to the runtime via the CRI.
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
✓
kubelet
The kubelet is the primary node agent that runs on every worker node in a Kubernetes cluster. It receives Pod specifications (Pod manifests) from the API server, either directly or via the kube-apiserver, and ensures that the containers described in those manifests are running and healthy. It does this by interacting with the container runtime (e.g., containerd or CRI-O) to start, stop, and monitor containers as needed.
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
kube-controller-manager runs control loop controllers and runs on the control plane, not worker nodes.
- ✗
container runtime
Why it's wrong here
container runtime runs containers but does not read Pod manifests; it is instructed by the kubelet.
- ✓
kubelet
Why this is correct
kubelet is the node agent that reads Pod manifests and ensures containers are running.
- ✗
kube-proxy
Why it's wrong here
kube-proxy handles network rules on nodes, not container lifecycle.
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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.