John works as a Network Security Professional. He is assigned a project to test the security of Intrusion Detection System on the We-are-secure server so that he can receive alerts about any hacking a

SARA (Security Auditor's Research Assistant) is a network vulnerability scanner that identifies known vulnerabilities in systems - it does not function as an IDS and does not generate alerts about live hacking attempts.

Snort is an open-source network-based intrusion detection and prevention system (NIDS) that inspects network traffic in real time and generates alerts for suspicious or malicious patterns, directly fulfilling the need to detect and alert on hacking attempts.

Tripwire is a file integrity monitoring solution that detects unauthorized changes to files and directories, but it is not designed to monitor network traffic or generate real-time intrusion alerts.

Samhain is an open-source host-based intrusion detection system (HIDS) that monitors file integrity, login activity, and system processes, generating alerts when unauthorized changes or access attempts are detected on a host.