Which are the two main types of intrusion detection systems?

The two main types of intrusion detection systems are network-based IDS (NIDS) and host-based IDS (HIDS).

A network-based IDS is designed to monitor and analyze traffic across the entire network. It captures and records data packets traveling over the network, allowing it to identify suspicious activities or intrusion attempts by examining traffic patterns and anomalies in real time. This centralized monitoring provides a broad oversight of the security posture of the entire network.

On the other hand, a host-based IDS operates on individual devices (hosts) such as servers or workstations. It monitors the activities of that specific host by analyzing system logs, file integrity, and user behaviors. HIDS is particularly useful for detecting insider threats, malware, or unauthorized changes to system files that occur locally on the host.

Understanding both types is crucial for implementing effective security measures. By employing both NIDS and HIDS, organizations can have a comprehensive approach to detecting intrusions at both the network and host levels, covering various attack vectors and improving overall security monitoring efforts.