network security barriers that control incoming and outgoing traffic
A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between trusted internal networks and untrusted external networks, such as the Internet.
Examines packets at the network layer and makes decisions based on source/destination IP addresses, ports, and protocols. Fast but limited in functionality.
Tracks the state of active connections and makes decisions based on the context of traffic. Maintains connection tables for better security.
Operates at the application layer, understanding specific protocols and applications. Provides deep packet inspection and content filtering.
Combines traditional firewall capabilities with advanced features like intrusion prevention, application awareness, and threat intelligence.
Try different firewall rules and see how they affect network traffic:
network packet reaches the firewall interface
Firewall checks packet against configured rules
Allow, deny, or log based on matching rule
Packet forwarded or dropped accordingly