If I block all Egress traffic, will my Pods still be able to resolve DNS names?

No! This is a very common mistake. If you apply a Default Deny Egress policy, your Pods cannot talk to the CoreDNS server. You must explicitly author an Egress rule allowing traffic on UDP port 53 to the `kube-system` namespace so DNS resolution continues to work.

Are NetworkPolicies a replacement for the Ingress Controller?

No. The Ingress Controller manages external traffic entering the cluster from the public internet. NetworkPolicies manage internal traffic (east-west traffic) moving between Pods inside the cluster.

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Securing with Network Policies

Master Kubernetes internal security. Learn the necessity of the Default Deny-All pattern, how to whitelist traffic using label selectors, and the critical difference between Ingress and Egress rules.

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