Hi,
If you have extended already the Active Directory Schema and published the management point, you don't need to specify the MP information in the command line, otherwise, you can add /logon to top the installation if a version of the client already exists on the computer.
It's recommended to push the client from the console, you can manage better and target only machines without ConfigMgr client.
- Group Policy installation
- Client installation methods in Configuration Manager
- Schema extensions for Configuration Manager
Regards,
Youssef Saad