- As the name indicates a star topology network takes the shape of a star, with all nodes of the network connected to a central device.
- A star topology network is also called as a hub and spoke network because the central device resembles a hub and the nodes connected to the hub resemble the spokes of a cycle tyre.
A typical star topology network diagram is given below, with all end nodes in the network connected through a central device:
- Here, all communication happens through the central node. The central node may be devices like hubs, repeaters, bridges, L2 switches etc.
- Whenever a sender node sends a frame to a specific destination node, a copy of it is sent to to every other node, if the central device is a hub or a repeater. If the central device is a bridge or a switch, then the central device may intelligently forward the frame only onto the destination node segment, thereby not burdening the other nodes with such frames.
- In a star topology, a collision resolution protocol is still required, as multiple end nodes may send frames simultaneously.
- 10/100 Mbps Ethernet are examples of protocols that use star topology.
- Star topology is the most common topology used in Ethernet LANs.