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Oracle Tips by Burleson |
Web Stalkers
Chapter 9 - Self Protection on the Web
What is a Firewall?
When many buildings are designed, they are
built with certain walls more durable than others. In concert with
specially designed doors, these walls make it more difficult for a
fire to spread. By slowing down or stopping the spread of the fire,
it allows more people to be evacuated safely. These safeguards are
called firewalls.
Positioning valuable assets so that they are
protected by firewalls also provides more security for important
documents and equipment. In computer security, a firewall slows
down or stops an attacker before they gain access to the information
that should be kept private. Figure 9.1 shows how a basic home
network would look with a firewall.
Figure 9.1 - A simple diagram of a home
network with a firewall
In the corporate world, organizations will
sometimes use multiple firewalls to separate different parts of the
organization for security reasons in addition to protecting its
resources from unauthorized outside access.
There are different types of firewalls that
provide different benefits. Hardware and software firewalls each
have strengths and weaknesses.
Types of Firewalls
All firewalls consist of both hardware and
software. The dividing line between what is classified as a
hardware firewall is whether or not the hardware is used primarily
as a firewall. If the hardware is primarily a firewall, it will be
called a firewall router. Multi-purpose devices such as a wireless
router fall into this category. Otherwise, it will be considered a
software firewall as it involves software being installed on a
computer or network system.
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