Intrusion Detection
Source: IT World - Posted by Jen Olson   
Intrusion Detection Definition -- Intrusion detection is the art and science of sensing when a system or network is being used inappropriately or without authorization. An intrusion-detection system (IDS) monitors system and network resources and activities and, using information gathered from these sources, . . . Definition -- Intrusion detection is the art and science of sensing when a system or network is being used inappropriately or without authorization. An intrusion-detection system (IDS) monitors system and network resources and activities and, using information gathered from these sources, notifies the authorities when it identifies a possible intrusion.

If a firewall is like having a security guard at your office door, checking the credentials of everyone coming and going, then an intrusion-detection system (IDS) is like having a network of sensors that tells you when someone has broken in, where they are and what they're doing.

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