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Appendix C Computer Security
Network Applications
Network applications (such as software programs) that allow remote access to the
computer also make the computer vulnerable to access from other people on the
Internet. If using a network application that allows remote access, consider install-
ing a firewall.
Electronic Security
Here are two methods to secure your computer electronically.
Network Address Translation
If a local area network and a PPP connection to the ISP using dynamic IP addresses
through a DHCP server are being used, Network Address Translation (NAT) is
being used. NAT provides a very basic level of security.
Firewalls
The safest way to prevent attacks on the computer is through a firewall – a hard-
ware device or software program that protects the computer from unauthorized
access by controlling who can access your computer and by monitoring the trans-
missions between the computer and the Internet
Windows XP has a built-in firewall. For more information, select Help and
Support Center from the Help menu. Search for Internet Connection Firewall.
If Windows 98 SE, Me, NT 4.0, or 2000 is running on the computer, consider install-
ing a firewall. Hardware and software firewall products are changing rapidly as
more homes and businesses establish high-speed digital connections between their
local area networks and the Internet.
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