IDS and IPS are intelligence modules (either hardware, software or virtual instances) that are often incorporated into firewalls, although they can be standalone appliances communicating with a firewall.
An Intrusion Detection System (IDS) is a device or application that analyses whole packets, both header and payload, looking for known events. When a known event is detected a log message is generated detailing the event.
An Intrusion Prevention System is a device or application that analyses whole packets, both header and payload, looking for known events. When a known event is detected the packet is rejected.
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