Firewall — Certified Kubernetes Administrator (CKA) Practice Questions

In the context of the CKA exam, firewall knowledge relates to how host-level network filtering, iptables rules, and cloud security groups interact with the Kubernetes networking model and can either enable or block necessary cluster traffic. Key ports that must be open include those used by the API server, etcd, kubelet, and NodePort service ranges. Candidates should understand how kube-proxy programs iptables or IPVS rules to implement Service load balancing, and how to diagnose connectivity failures that stem from firewall rules dropping traffic rather than from Kubernetes configuration errors.

Free questions on firewall