KCNA Kubernetes Fundamentals Practice Question
What is the function of kube-proxy on a worker node?
⚠ Common exam trap
A common misconception is that kube-proxy handles pod lifecycle or node health reporting, when in fact those are kubelet responsibilities. Candidates often confuse the 'proxy' name with general node management.
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
✓
It implements part of the Kubernetes Service concept by managing network rules
kube-proxy runs on each worker node and is responsible for implementing the Kubernetes Service abstraction by managing network rules (e.g., iptables, IPVS, or userspace mode). It watches the API server for Service and EndpointSlice changes and configures local packet filtering or forwarding rules to route traffic to the correct backend pods, enabling load balancing and service discovery.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It ensures the desired number of pods are running
Why it's wrong here
That is the job of the ReplicaSet controller, part of kube-controller-manager.
- ✗
It runs the container runtime
Why it's wrong here
Container runtime (e.g., containerd) runs containers, not kube-proxy.
- ✗
It reports node status to the control plane
Why it's wrong here
kubelet reports node status; kube-proxy focuses on networking.
- ✓
It implements part of the Kubernetes Service concept by managing network rules
Why this is correct
kube-proxy handles IP tables/IPVS rules for service load balancing.
Go deeper
Related to this question
Learn chapter
Kubernetes Overview and Core Components
Key term
ReplicaSet and Replication
A ReplicaSet ensures a specified number of identical pod instances are running at all times in Kubernetes, using replication to maintain availability and stability.
Key term
Kubernetes API Primitives
Kubernetes API Primitives are the basic building blocks that the Kubernetes API uses to represent and manage the state of a cluster, such as Pods, Services, Deployments, and Namespaces.
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Same concept, more angles
1 more way this is tested on KCNA
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Variation 1. What is the purpose of kube-proxy on a worker node?
medium- A.To run the container runtime
- B.To store cluster configuration data
- ✓ C.To implement network rules and handle service traffic routing
- D.To monitor pod health and restart unhealthy containers
Why C: Kube-proxy is the component responsible for implementing network rules on each worker node, enabling service abstraction by managing IP tables or IPVS rules to route traffic to the appropriate pods. It handles service discovery and load balancing for ClusterIP, NodePort, and LoadBalancer service types, ensuring that traffic destined for a service is correctly forwarded to healthy pod endpoints.
JA
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.