Firewall
Tools: In computing, a firewall is a piece of
hardware and/or software which functions in
a networked environment to prevent some communications
forbidden by the security policy, analogous
to the function of firewalls in building construction.
A firewall is also called a Border Protection
Device (BPD), especially in NATO contexts, or
packet filter in BSD contexts. A firewall has
the basic task of controlling traffic between
different zones of trust. Typical zones of trust
include the Internet (a zone with no trust)
and an internal network (a zone with high trust).
The ultimate goal is to provide controlled connectivity
between zones of differing trust levels through
the enforcement of a security policy and connectivity
model based on the least privilege principle.
Proper configuration of firewalls demands skill
from the administrator. It requires considerable
understanding of network protocols and of computer
security. Small mistakes can render a firewall
worthless as a security tool. |
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