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Chapter 1. Firewalls and Network Securit... > Main Categories of Network Firewalls
Main Categories of Network Firewalls
Although this book is centered around stateful firewalls, it is instructive to quickly review the main classes of network firewalls.
Packet Filters
Packet filters are first-generation firewalls that concentrate their access control efforts on some network and transport layer parameters of individual packets. They are stateless in nature because they do not have the concept of state table or connection.
