The two most known Remote Desktop Service on linux are XDMCP and VNC.
- XDMCP because of the nature of X11, allowing network support directly into the protocol by design. Mostly known by advanced linux admins and seniors unix users.
- VNC because of the easy to install a server, the availability to get a free server and client. Mostly known by users working on other platform (Windows, Mac).
These two protocol suffer from performance issue.
There is still place for RDP, mostly known because of the remote desktop service for microsoft servers, also some implementation exist in Linux: xrdp
