CrystalNet advises on security protection and installs
the correct firewall on the network.
A computer firewall protects networked servers/workstations
from intentional hostile intrusion that could compromise
confidentiality or result in data corruption or denial of
service. It may be a hardware device or a software program
running on a secure host computer. In either case, it must
have at least two network interfaces, one for the network
it is intended to protect, and one for the network it is
exposed to. A network firewall sits at the junction point
or gateway between the two networks, usually a private network
and a public network such as the Internet.
Anyone who is responsible for a private network that is connected
to a public network needs firewall protection. Furthermore,
anyone who connects so much as a single computer to the Internet
via modem should have a firewall installed. Irresponsible
pranksters can use automated robots to scan random IP addresses
and attack whenever the opportunity presents itself.
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