International Journal of Advanced Research in Computer Science and Software Engineering (IJARCSSE)
Network Intrusion Detection System (NIDS) is an independent system that monitors the network traffic and analyzes them if they are free from attack or not. Network Intrusion Detection System (NIDS) is an intrusion detection system that attempts to discover unauthorized access to a computer network by analyzing traffic on the network for malicious activity. Traffic on the network may consist of any connection, Connectionless or connection-oriented. Connectionless use UDP protocol and connection-oriented use TCP protocol.