Yes, and they should!! As a network grows through the different stages of its development, a good network design will encourage the implementation of multiple firwall implementations at strategic points of the physical network. There are different types of firewalls that run on different hardware devices within a network.

Some of the different types of firewalls are:

• Packet Filters
• Stateful Filters
• Network Layer Stateful Firewall
• Network Layer Stateless Firewall
• Network Layer Modem Firewall
• Application Layer Firewall
• Proxies