This CKA practice question tests your understanding of cluster architecture, installation and configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which of the following is a core control plane component of Kubernetes?
kubelet
Why wrong: The kubelet runs on worker nodes, not in the control plane.
CoreDNS
Why wrong: CoreDNS is an addon for cluster DNS, not a core control plane component.
kube-apiserver
The kube-apiserver is the front-end of the Kubernetes control plane and exposes the API.
CRI-O
Why wrong: CRI-O is a container runtime, not a control plane component.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
kube-apiserver
The kube-apiserver is the front-end of the Kubernetes control plane and the only component that directly interacts with the etcd datastore. It validates and processes all REST API requests, making it the core control plane component responsible for exposing the Kubernetes API and managing the cluster state.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
kubelet
Why it's wrong here
The kubelet runs on worker nodes, not in the control plane.
CoreDNS
Why it's wrong here
CoreDNS is an addon for cluster DNS, not a core control plane component.
kube-apiserver
Why this is correct
The kube-apiserver is the front-end of the Kubernetes control plane and exposes the API.
Related concept
Read the scenario before looking for a memorised answer.
CRI-O
Why it's wrong here
CRI-O is a container runtime, not a control plane component.
Common exam traps
The trap here is that candidates often confuse node-level components (kubelet, CRI-O) or cluster add-ons (CoreDNS) with core control plane components, because all are essential for a working cluster but only the kube-apiserver, kube-controller-manager, kube-scheduler, and etcd are considered core control plane components.
Detailed technical explanation
The kube-apiserver is designed to scale horizontally by running multiple instances behind a load balancer, and it uses etcd's watch mechanism to notify other components of cluster state changes. It implements authentication, authorization, admission control, and API versioning (e.g., v1, apps/v1) to enforce security and compatibility. In production, a misconfigured API server can lead to cluster-wide outages, as all kubectl commands and controller interactions depend on it.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CKA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: kube-apiserver — The kube-apiserver is the front-end of the Kubernetes control plane and the only component that directly interacts with the etcd datastore. It validates and processes all REST API requests, making it the core control plane component responsible for exposing the Kubernetes API and managing the cluster state.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CKA 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 CKA exam.
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