Verify that the client system can connect over TCP/IP to the server using a domain name server (DNS) or a local hosts file. Use the tdxodbc or tdxodbc64 program in the <InstallDir>/Teradata/client/TTU version>/bin directory to verify the connection and successful loading of the Teradata ODBC driver.
The local hosts file contains the names and IP addresses of system nodes that support the Teradata network communication interface.