KCNA Kubernetes Fundamentals Practice Question
What is the purpose of kube-proxy on a worker node?
⚠ Common exam trap
CNCF often tests the misconception that kube-proxy handles pod health checks and restarts, but that is actually the kubelet's job, while kube-proxy only deals with network traffic routing and service abstraction.
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
✓
To implement network rules and handle service traffic routing
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To run the container runtime
Why it's wrong here
The container runtime, such as containerd or CRI-O, is responsible for pulling images and managing container lifecycle, not for implementing network rules. Kube-proxy operates at a different layer: it watches the Kubernetes API for Service endpoints and programs iptables or IPVS rules on the node to route traffic to the correct Pods. This option is tempting because both components run on worker nodes and are essential for Pod networking, but the container runtime handles execution isolation, not the service-level packet forwarding that kube-proxy provides.
- ✗
To store cluster configuration data
Why it's wrong here
etcd stores cluster data, not kube-proxy.
- ✓
To implement network rules and handle service traffic routing
Why this is correct
kube-proxy configures iptables or IPVS rules to route traffic to the correct Pods.
- ✗
To monitor pod health and restart unhealthy containers
Why it's wrong here
The kubelet is responsible for pod health and restarts.
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Written by Johnson Ajibi, MSc IT Security
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