Is Cisco PIX Application level firewall or Packet level firewall?

It's a Stateful Inspection firewall.

Chris.

Packet firewall

In article , coin wrote, without providing any context :(

:Packet firewall

The question was whether the PIX was an application level firewall or a packet firewall.

The answer is that it runs at layer 5 or so -- a protocol level firewall. Most of what it does, it handles at layer 4, but there are some things it handles at layer 5, such as SMTP inspection, FTP port handling, and URL inspection. For SMTP and HTTP, it reassembles packets to prevent attacks from slipping by by splitting them between packets. For SMTP, it filters the complete layer 5 conversation, permitting only those commands that are on its internal allowed list.

PIX 6.x has no anti-virus, and does not attempt to do anything like validate SQL queries against an authorization schema.