A central node connects a cable to each computer in the network in a star topology. Each computer in the network has an independent connection to the center of the network, and if one connection breaks, it won’t affect the rest of the network. However, one downside is that many cables are required to form this kind of network.
In a bus topology network connection, one cable connects the computer. The information for the last node on the network must run through each connected computer. There is less cabling required, but if the cable breaks, none of the computers can reach the network.
A ring topology is like a bus topology because it uses a single cable with the end nodes connected to each other so the signal can circle through the network to find its recipient. The signal will try several times to find its destination even when the network node is not working properly.
More info: what is a firewall
