PIX, commonly referring to the Cisco PIX (Private Internet eXchange) Firewall, was a popular dedicated hardware firewall appliance developed by Cisco Systems. It was designed to provide network security through stateful packet inspection, access control, and network address translation (NAT). PIX firewalls were widely used in enterprise networks to protect internal resources from external threats by controlling network traffic based on predefined rules and policies. Cisco has since discontinued the PIX Firewall product line, replacing it with the Cisco ASA (Adaptive Security Appliance).
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