In a bus network, all the workstations, servers and printers are all connected to one cable ( the bus ). One advantage is that it is easy to install. The disadvantage is that if the main cable fails then the whole network will fail.
In a Ring Network, each device is connected to two other devices, this forms a ring for signals to travel around. The advantage is that this type of network can travel data quickly. The disadvantage is that if the main cable fails then the whole network will fail.
In a star network each device on the network has its own cable that connects to a switch or hub. The advantage is that high performing as no data collisions can occur. The disadvantage is that if a hub or switch fails all the devices connected to it will have no network connection.