They are referring to the OSI model. Just look in any TCP/IP text book and it will make sense.
Highlights: Level 3) IP addresses, routing Level 4) Ports (tcp/udp) Level 7) Application intelligence, like detecting activeX plugins, java, etc ----- Original Message ----- From: "David Campbell" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, April 01, 2002 2:27 PM Subject: Firewalls > What is the difference between the various levels of Firewalls. My current > requirement is comparing a (router-based) level 3 firewall to a (PIX) level > 7 firewall. Can anyone explain the differences? > > Does anyone know of a good resource that defines/compares the attributes of > firewalls of different levels (perhaps in tabular form)? > > Thanks, > > Dave > > >
