Watchguard Firebox X5-W Betriebsanweisung PDF herunterladen (Seite 22)

Introduction to Network Security

6 Firebox X Edge e-Series

Firewalls

A firewall divides your internal network from the Internet to decrease risk from an external attack. The

computers and networks on the Internet are the external network. The computers on the internal side

of the firewall are the trusted computers. The figure below shows how a firewall divides the trusted

computers from the Internet.

Firewalls use access policies to identify different types of information. They can also control which ser-

vices or ports the protected computers can use on the Internet (outbound access). Many firewalls have

sample security policies and users can select the policy that is best for them. With others, including the

Firebox® X Edge e-Series, the user can customize these policies.

Firewalls can be in the form of hardware or software. Firewalls prevent unauthorized Internet users

from private networks connected to the Internet. All messages that enter or go out of the trusted or

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Watchguard Firebox X5-W Betriebsanweisung Seite 22