It has to do with wires, cabling, hubs, and other hardware devices. In a bus topology the computers on the network are linked in one consecutive line, like bus stops on a bus route. The big disadvantage of bus topologies is that if one computer is disconnected or a link is broken, the whole network goes down. This is a more complex topology. At the centre of a network is a hub to which all the computers on the network are directly linked.
Star topologies are reliable and computers can be disconnected without the network going down.
It is easy to add new workstations. The wiring and connections are more expensive but all users have equal access and cable failures only affect a small number of users. Before continuing to develop the theory of networking, let's review some of the hardware devices that make up a network. The physical network is the arrangement of hardware devices that make up the network. The logical network refers to those bits of the network that are not hardware.