Which command should I use to execute the following :

Now that you have solved the routing issue you have access to the remote server and need to check for issues with its services. The previous network administrator left a note about a service running on TCP port 81 . You decide to probe it by connecting via command line and sending some data to the server to elicit a response. - Use a command line tool to connect to TCP port 81 on neat-sheets.lab and send some data to get a server response