Date Added: Mar 2012
A network intrusion is any type of attack or malicious activity that can compromise the stability or security of a network environment. Intruders can be classified in two groups. External intruders don't have authorized access to the system or network they attack, while internal intruders have some authority access to the system. Network intrusions keep increasing over the years with new emerging and complex threats. This new emerging threats are the most difficult to identify. A Network Intrusion Detection System (NIDS) is one that scans the network activities in a computer environment and attempt to detect the intrusions or attacks. Then, the system administrator may be alerted to the take the corrective actions.