Which of the following tools can perform real-time traffic and port analysis, and can also detect port scans, fingerprinting and buffer overflow attacks?

Snort is the tool that can perform real-time traffic and port analysis and can also detect port scans, fingerprinting, and buffer overflow attacks. Snort is an open-source intrusion detection system (IDS) and intrusion prevention system (IPS) that is widely used for network security monitoring. It can analyze network traffic, detect suspicious activities, and trigger alerts based on predefined rules. Snort is particularly effective at identifying various network-based attacks, including port scans, fingerprinting, and buffer overflow attempts. SIEM (Security Information and Event Management), on the other hand, is a broader security solution that can collect and analyze security-related data but may not be as specialized as Snort in detecting specific network-level attacks. Nmap is a network scanning tool, and NetFlow is a protocol used for network traffic monitoring and analysis but is not typically used for intrusion detection and prevention.