What are firewalls techniques?

Firewall techniques include packet filtering, where individual packets are analyzed and allowed or blocked based on predefined rules; stateful inspection, which tracks the state of active connections and makes decisions based on the context of the traffic; and application-layer filtering, which examines data at the application level to detect and block malicious content. Other techniques involve proxy services, where the firewall acts as an intermediary between users and the internet, and intrusion detection systems that monitor traffic for suspicious activity. These methods work together to enhance network security by controlling access and preventing unauthorized data transmission.