ecurity is a big issue for all networks in today’s enterprise environ-ment. Hackers and intruders have made many successful attempts tobring down high-profile company networks and web services. Manymethods have been developed to secure the network infrastructure andcommunication over the Internet, among them the use of firewalls,encryption, and virtual pri vate networks. Intrusion detection is a relativelynew addition to such techniques. Intrusion detection methods startedappearing in the last few years. Using intrusion detection methods, youcan collect and use information from known types of attacks and find outif someone is trying to attack your network or particular hosts. The infor-mation collected this way can be used to harden your network security, aswell as for legal purposes. Both commercial and open source pr oducts arenow available for this purpose. Many vulnerability assessment tools arealso available in the market that can be used to assess different types ofsecurity holes present in your network. A comprehensive security systemconsists of multiple tools, including:
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