A firewall is used to protect the
internal network from the public and insecure Internet. Firewalls may
be implemented using hardware or software. A software firewall is a
set of programs on the gateway, which monitors all traffic flowing in
and out of a network and are often implemented using specifically
configured routers. All information must go through the firewall and
be verified against a specific set of rules. If the information does
not meet the specified rules, the data is bounced back and cannot
continue until it meets the set standards. An example of hardware
firewall is using specially configured routers to control inbound and
outbound traffic.
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