User guide

Introduction to Network Security
8 WatchGuard Firebox X Edge
Firewalls
A firewall divides your internal network from the Internet to
decrease risk from an external attack. We refer to the computers and
networks on the Internet as the external network. The computers on
the internal side of the firewall are protected. We refer to these as
trusted computers. The figure below shows how a firewall divides
the trusted network from the Internet.
Firewalls let users create access policies for the Internet traffic that
goes to the computers they protect. They can also control which ser-
vices or ports the protected computers can use on the Internet (out-
bound access). Many firewalls have sample security policies and
users can select the policy that is best for them. With others —such
as the Firebox® X Edge— the user can customize these policies.