This KCNA practice question tests your understanding of container orchestration. 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 component is responsible for running containers on a Kubernetes node?
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 Kubernetes node. It is responsible for ensuring that containers are running in a Pod as expected, by interacting with the container runtime (e.g., containerd or CRI-O) to start, stop, and monitor containers based on PodSpecs received from the API server.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
The controller manager runs controllers that handle routine tasks, but it does not directly run containers on nodes.
✗
kube-proxy
Why it's wrong here
kube-proxy handles network proxying and load balancing for Services, not container execution.
✗
kube-apiserver
Why it's wrong here
The API server is the front-end of the Kubernetes control plane and does not run containers.
✓
kubelet
Why this is correct
The kubelet runs on each node and manages pod lifecycles, including starting containers via the container runtime.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse kubelet with kube-controller-manager, thinking the controller manager handles node-level container operations, but the kubelet is the only component that directly manages containers on the node.
Detailed technical explanation
How to think about this question
The kubelet uses the CRI (Container Runtime Interface) to communicate with the container runtime, abstracting away runtime-specific details. It also performs liveness, readiness, and startup probes by executing commands or making HTTP/gRPC calls to the container's IP and port. In a real-world scenario, if the kubelet fails, the node is marked as NotReady by the Node Controller, and Pods are rescheduled only if they are managed by a controller like a Deployment.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the KCNA 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA question in full detail.
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubelet — The kubelet is the primary node agent that runs on each Kubernetes node. It is responsible for ensuring that containers are running in a Pod as expected, by interacting with the container runtime (e.g., containerd or CRI-O) to start, stop, and monitor containers based on PodSpecs received from the API server.
What should I do if I get this KCNA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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