Final answer:
The command to check inbound and outbound TCP/IP connections is 'netstat'. It provides details on all current connections, protocols, and network statistics.
Step-by-step explanation:
To check the inbound and outbound TCP/IP connections on a machine, the command you would use is netstat. This command enables you to view all current connections and listening ports, which include inbound and outbound connections, protocol used, and other network statistics. The netstat command is quite versatile and can be used on various operating systems, including Windows, Linux, and macOS.