ntrusion detection is a system which helps in determining possible attacks and deal with it. Intrusion detection includes collecting information from many systems and sources, analysis of the information and find out the possible ways of attack on the system.
Intrusion detection check following:
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IDS are such devices either hw or sw, which inspects the network traffic, scan it against signatures/heuristics to identify any malicious activity such as malwares or vulnerability attacks, and generates alerts/alarms so that security team can analyze that. A prominent difference between intrusion detection systems and intrusion protection systems is that IDS only detects the attack/malicious content, while IPS detects and stops the particular traffic. These can be deployed either in central network backbone or inside systems.