Name two popular IDS tools.

The selection of Snort and Suricata as popular IDS (Intrusion Detection System) tools is appropriate because both are widely recognized for their effectiveness in network security monitoring.

Snort is an open-source IDS that is highly regarded in cybersecurity circles. It analyzes network traffic in real-time and can detect a variety of attacks by looking for specific signatures or anomalies. Its flexibility and wide adoption make it a staple tool for many security professionals.

Suricata is another open-source IDS that provides similar functionality but with some enhancements over Snort, including multi-threading capabilities and the ability to act as an intrusion prevention system (IPS) as well. Suricata can also analyze traffic at deeper levels, supporting functions like file extraction and HTTP log analysis. This makes it a strong contender in the field of cybersecurity tools.

The combination of these two tools exemplifies a solid approach to network intrusion detection, as they both offer robust features and broad community support in terms of updates, plugins, and rule sets for detection.