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An Introduction to Network Intrusion Detection Systems

Network intrusion detection systems identify security threats by detecting evil activity such as scans, denial of service attacks and unauthorized access through the examination of network traffic. They're installed at strategic points on the network to monitor traffic from and to all hosts on the network. Unlike a packet filter or firewall, where a packet filtering call is formed on whether or not to allow traffic to continue, network intrusion detection systems do not interfere with network traffic in any way.

In 1997 ISS released Real Secure, the first commercial network intrusion detection system which shortly started to rise in popularity. The following year Cisco took an interest in this area of security by getting a security company called 'Wheel Group' to supply their customers with similar technologies. From this point, a bunch of companies took interest and became concerned in developing and developing commercial systems. Network intrusion detection systems are now among the most typically used network based security tools. If a networked PC system isn't equipped with a network intrusion detection system the network directors might be unaware of many attacks that take place and only become mindful of a successful attack when it symptoms happens. An example of such an attack could be where an unauthorized user retrieves password files from a login server without damaging the host. The assault may only become clear when the intruder uses the password to gain root privileges, by which time the system security would be severely compromised. In an environment supplied with a network intrusion detection system, when a successful or unsuccessful attack occurs, a security alert is generated and info is collected which might be invaluable as proof if action in the courts is to be taken or in preventing the attack from happening.

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