The PIX Firewall delivers unprecedented levels of security, performance, and reliability, including robust, enterprise-class security services such as the following:

"Stateful inspection security, based on state-of-the-art Adaptive Security Algorithm (ASA)

"Over 100 predefined applications, services, and protocols for flexible access control

"Virtual Private Networking (VPN) for secure remote network access using IKE/IPSec standards

"Intrusion protection from over 55 different network-based attacks

"URL filtering of outbound web traffic through third-party server support

"Network Address Translation (NAT) and Port Address Translation Support (PAT)

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00808554ed.shtml

http://www.cisco.com/en/US/docs/security/pix/pix63/release/notes/pixrn635.html