You need a tool that can do network intrusion prevention and intrusion detection, function as a network sniffer, and record network activity. What tool would you most likely select?

Snort is an open-source network-based intrusion detection and prevention system (NIDS/NIPS) that operates in three modes: sniffer, packet logger, and network intrusion detection/prevention. It uses rule-based analysis to inspect traffic in real time and can log packets for later review, making it the only tool in the list that satisfies all four stated requirements simultaneously.

Nmap is a port scanner and network discovery tool, not an IDS/IPS or packet logger.

Cain and Abel is primarily a Windows password recovery and credential-cracking tool, not a network IDS/IPS.

Nessus is a vulnerability scanner used for host-based assessments, not for intrusion detection or packet capture.