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CKA study material · question 754 of 1000

You are writing firewall rules for a control plane node. Which two inbound ports are needed by default? Choose two.

  1. 6443 for the API server
  2. 10256 for kube-proxy
  3. 2379-2380 for etcd
  4. 30000-32767 for NodePort Services
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Answer: A. 6443 for the API server
C. 2379-2380 for etcd

A control plane node needs 6443, 2379-2380, 10250, 10259 and 10257. Port 10256 and the NodePort range belong to the worker node table.

Source: Ports and Protocols (Kubernetes) — Control plane

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