SQL Server Native Client (SNAC) is not supported beyond SQL Server 2012. Avoid using SNAC in new development work, and plan to modify applications that currently use it. The Microsoft ODBC Driver for SQL Server provides native connectivity from Windows to Microsoft SQL Server and Microsoft Azure SQL Database.
The SQL Server Native Client ODBC driver supports various SQL Server-specific keyword/value pairs for data source configuration attribute strings.
For a list of the keywords available in the SQL Server Native Client ODBC driver, see Using Connection String Keywords with SQL Server Native Client.