Packet Filtering
Packet filtering is a network security technique that inspects and controls data packets as they traverse a network based on predefined rules. It operates at the network layer (Layer 3) and transport layer (Layer 4) of the OSI model, examining packet headers for attributes like source/destination IP addresses, ports, and protocols. This allows administrators to allow, block, or log network traffic to enforce security policies, prevent unauthorized access, and manage network performance.
Developers should learn packet filtering to implement network security in applications, configure firewalls, and troubleshoot connectivity issues in distributed systems. It is essential for building secure cloud infrastructure, managing microservices communication, and ensuring compliance with data protection regulations. Use cases include setting up firewall rules in AWS Security Groups, filtering traffic in Kubernetes network policies, and securing APIs in web applications.