Which tool would a network administrator use to check for active TCP connections on a computer?

The tool used by a network administrator to check for active TCP connections on a computer is netstat. This command-line utility provides detailed information about network connections, including active TCP connections, listening ports, and other network statistics. Specifically, when executed, it displays all active connections along with their respective local and remote addresses and the state of the connection (for example, established, listening, or closed).

Netstat is an essential tool for diagnosing network issues, monitoring network activity, and managing network security. It’s particularly useful for identifying open ports and connections that could potentially be exploited or are unauthorized.

The other tools mentioned serve different purposes. For example, netuse is used for mapping network drives, netmap typically relates to mapping network topologies or configurations, and nmap is primarily used for network exploration and security auditing, such as performing scans on hosts to determine open ports but does not directly show the current active TCP connections on a specific machine.