This is the dataset used for the third international competition for knowledge discovery and data mining, which was held together with KDD-99 The Fifth International Conference on Knowledge Discovery and Data Mining. The task of the competition was to build a network intrusion detector, a predictive model capable of distinguishing between "bad" connections, called intrusions or attacks, and "good" normal connections. This database contains a standard set of data to be audited, which includes a wide variety of simulated intrusions in a military network environment.