Which technology provides for a hub-and-spoke design?

The E-Tree services of Metro Ethernet allow for a root to be established to serve the remote sites or leaf endpoints. The root can communicate to the leaf endpoints and the leaf endpoints can communicate to the root. However, the leaf endpoints cannot communicate with each other. Wireless WAN provides connectivity by using a star topology. E-Line and E-LAN provide services in a point-to-point or point-to-multipoint topology.