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Appendix C Computer Security
program is known to be safe. A program from an unknown source can delete all
the files on the computer's hard disk or install a "backdoor" software application
that lets people on the Internet gain access to the computer without permission.
Internet Browsers
Always exit the Internet browser (for example, Internet Explorer or Netscape
Navigator). Never "minimize" the browser or leave it open in the background.
Breaking into a computer is easier when an Internet browser is running.
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
installing a firewall.
Electronic Security
Here are two methods to secure your computer electronically.
Network Address Translation
If a local area network and a
connection to the
using dynamic IP
PPP
ISP
addresses through a
server are being used, Network Address Translation
DHCP
(
) is being used.
provides a very basic level of security. See the Qwest
NAT
NAT
book for more information about
.
DSL LAN
NAT
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
transmissions between the computer and the Internet
Windows
has a built-in firewall. For more information, select Help and
XP
Support Center from the Help menu. Search for Internet Connection
Firewall.
If Windows
,
, Me,
, or
is running on the computer, consider
98
98 SE
NT 4.0
2000
installing a firewall. Hardware and software firewall products are changing rap-
idly as more homes and businesses establish high-speed digital connections
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