-: Intrusion Detection System (IDS) :-
An intrusion detection system (IDS) is software and/or hardware based system that monitors network traffic and monitors for suspicious activity and alerts the system or network administrator. In some cases the IDS may also respond to anomalous or malicious traffic by taking action such as blocking the user or source IP address from accessing the network.
Typical locations for an intrusion detection system is as shown in the following figure -
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