A tree topology is a variation on a star. In this case the central hub might connect to a number of secondary hubs forming a sort of hierarchy of stars. Secondary hubs may be passive or active devices. An active hub acts as a repeater and amplifier for the signals in each direction. This is ideal for networks with remote nodes as link distances can be effectively lengthened without attenuation. A passive hub supplies connections only between the next hub and the nodes below.
- Secondary hubs increase the number of devices that may be part of the network
- Hubs can be used to prioritize and isolate traffic on different parts of the network.
- Other advantages as per star topology