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That said, there is some benefit gained from choosing interoperable security products, which is what the "self-defending" expression may be suggesting. If you have an intrusion prevention system (IPS), security incident manager and network admission control (NAC) system that can recognize each other and even make use of each others' data, you can save a great deal of time that you'd normally spend correlating events from each system individually.
As with any marketing catchphrase, I'd urge you to take the term "self-defending network" with a grain of salt. Perhaps the idea would be more accurately termed as a "coordinated defense network." But I guess that wouldn't sell as many widgets.
This was first published in October 2007