A firewall technology that ensures that all inbound packets are the result of an outbound request. Also called "stateful packet inspection" (SPI), it was designed to prevent harmful or unrequested ...

To enable all of the networking magic that makes this possible, the packet is split into two main components: Traditional firewalls use stateless packet filtering, which examines only the header ...

A security method that is used to authenticate a valid user and open a TCP/IP port to accept incoming packets. Firewalls accept or deny packets before any user authentication is performed.