Now a day’s as the computer technology evolves and the use of internet is increased, it is very important to provide a high level security to protect highly sensitive and private information. So we use Intrusion Detection System to provide high level security. The main task of Intrusion Detection System (IDS) is to identify between intrusive activity and normal behavior. In order to detect the intrusion various approaches have been developed and proposed over the last decade. This paper includes an overview of Intrusion Detection System, some fundamental concept and various soft computing techniques like: Neural Network (NN), Fuzzy Logic, Support Vector Machine (SVM) and Genetic Algorithm (GA) to determine Intrusion over the computer Network. A robust IDSs system lays a foundation to build an efficient Intrusion Detection System.
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