Which utility can be used to view a list of open TCP connections on Linux or Windows systems?

On both Linux and Windows systems, the utility that can be used to view a list of open TCP connections is called "netstat".

Here are the steps to use it:

1. Open a command prompt:

   • On Linux: You can open a terminal window by right-clicking on the desktop and choosing "Open Terminal", or by pressing Ctrl+Alt+T.
   • On Windows: Press the Windows key + R, type "cmd" in the Run box that appears, and press Enter.

2. Type the command "netstat" and press Enter. This will display a list of all active connections.

3. If you want to see only the TCP connections, you can use the command "netstat -t" on Linux or "netstat -a | findstr TCP" on Windows.

4. To continuously monitor the connections, you can use the command "netstat -t -c" on Linux or "netstat -a -n -o" on Windows.

Remember, you might need administrative privileges to run these commands.