Layered security is a widely accepted principle of computer and network security. The basic premise is that it takes multiple layers of defense to protect against the wide variety of attacks and threats. Not only can one product or technique not protect against every possible threat, therefore requiring different products for different threats, but having multiple lines of defense will hopefully allow one product to catch things that may have slipped past the outer defenses.
There are plenty of applications and devices you can use for the different layers- antivirus software, firewalls, IDS (Intrusion Detection Systems) and more. Each has a slightly different function and protects from a different set of attacks in a different way.
One of the newer technologies is the IPS- Intrusion Prevention System. An IPS is somewhat like combining an IDS with a firewall. A typical IDS will log or alert you to suspicious traffic, but the response is left to you. An IPS has policies and rules that it compares network traffic to. If any traffic violates the policies and rules the IPS can be configured to respond rather than simply alerting you. Typical responses might be to block all traffic from the source IP address or to block incoming traffic on that port to proactively protect the computer or network.
Read this full article at netsecurity.about.com
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