This document discusses an improved method for detecting intrusions in computer networks using machine learning algorithms, particularly evaluating the effectiveness of various algorithms on the KDDCup 99 dataset. The study highlights that algorithms such as J48, J48Graft, and Random Forest perform significantly better in identifying intrusive activities compared to others. The paper also explores the limitations of existing intrusion detection systems, especially concerning false alarms and the balance between misuse and anomaly detection methods.