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Today Network Intrusion Detection and Intrusion Prevention System (NIDS/IPS) are considered as one of the hottest topics in computer security. NIDS monitor suspicious behavior in computer networks. The cases are unauthorized use, anomalous behavior, and attempts to deny users, machines or access to services. On the other side firewalls which have been introduced from 1989 have optimized several times and different types have been introduced. Today by integrating NIDS and Firewall a new product comes to the market, which is called IPS. By encompassing aspects of many well-known, existing security technologies including anti-virus, software, intrusion detection and firewalls, IPSs protect information systems from unauthorized access, damage or disruption.
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