With hacker attacks against well-known businesses and organizations on the rise, network security has made headlines. Of course, there are many attacks that do not make headlines and are not reported due to a loss of credibility or embarrassment. Then there are the attacks that are not even detected. The Defence Information Services Agency (DISA) states that up to 98% of attacks go unnoticed. These revelations have caused many businesses to rethink or to start thinking about the security of their own networks. For some organizations security has always been a concern, for these organizations they were ahead of the game and already had a basic security policy in place. Security of a network cannot be trusted to just one method of security; it must consist of many layers of security measures. These security measures may consist of, strong passwords, screening routers, firewalls, proxy servers, and intrusion detection systems. Intrusion detection systems, also known as IDSs. An IDS is an important part of modern network security. Intrusion detection is the monitoring of a computer network with the goal of detecting an attack. IDSs do this well, but must be used in conjunction with other security measures. There are two major types of IDSs,

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