What tool can the system administrator use to view active TCP and UDP connections in the system?

Netstat is a networking utility that provides a wealth of information about active TCP and UDP connections on a system. It displays the current network connections, listening ports, routing tables, and various network interface statistics. System administrators commonly use Netstat to monitor network activity and diagnose connectivity issues.

This tool is particularly effective because it provides a snapshot of active connections, including the local and remote IP addresses, port numbers, and the state of the connections (such as established, listening, or closed). This capability is essential for identifying unauthorized connections or potential issues in communication between devices on a network.

While other tools mentioned have specific functions, like PsList for process management, Tasklist for listing running processes, and Wireshark for packet analysis, they do not focus primarily on displaying real-time TCP and UDP connection details. Thus, Netstat emerges as the most relevant tool for this particular need.