Firewall
Overview
Definition
Methods of Screening
Types of Firewall
Brands of Firewall
Bibliography

Types of Firewall

Network-Level Firewalls
First generation of firewalls
Fast, but they do not understand languages like HTML and XML
They can’t validate user inputs or detect maliciously modified URL requests
Works at the network level by inspecting packet headers and filtering based on the IP address of the source and the destination, the port and the service
Some applications could also filter based on protocols or the domain name of the source