KCNA Kubernetes Fundamentals Practice Question
Which component on each worker node is responsible for ensuring that containers are running as specified in the Pod manifest?
⚠ Common exam trap
A common trap in the KCNA exam is confusing the kubelet with the container runtime. Remember: the kubelet is the Kubernetes agent that ensures containers are running as specified, while the container runtime is the underlying software (like containerd) that actually executes the containers.
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 each worker node. It receives Pod manifests (via the API server or a file) and ensures the containers described in those manifests are running and healthy. It interacts with the container runtime (e.g., containerd) to create, start, and stop containers as needed, continuously reconciling the actual state with the desired state defined in the Pod spec.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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kube-scheduler
Why it's wrong here
kube-scheduler runs in the control plane, binding unscheduled Pods to nodes based on resource requests, affinity and taints; it does not monitor containers after placement. It is the correct choice when asked which component assigns Pods to nodes.
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container runtime
Why it's wrong here
The container runtime (containerd, CRI-O) only pulls images and starts or stops individual containers when instructed via the CRI; it does not reconcile Pod state. It is correct when asked what actually executes containers on a node.
- ✓
kubelet
Why this is correct
kubelet runs on every worker node and reconciles the node's containers against their PodSpecs, starting, stopping and reporting container status. This directly satisfies the stem's requirement for the per-node component ensuring containers run as specified in the Pod manifest.
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kube-proxy
Why it's wrong here
kube-proxy programs iptables or IPVS rules on the node to implement Service virtual IPs and load balancing; it never starts or restarts containers. It is the right answer when the question concerns how ClusterIP or NodePort traffic reaches a backing Pod.
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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.