Ring: each computer is connected to the ones either [blank_start]side[blank_end] of it. Data is [blank_start]sent[blank_end] in one direction, no reliance on [blank_start]central server[blank_end], but if any connection [blank_start]breaks[blank_end] the whole network is disrupted.
Star: each [blank_start]computer[blank_end] is connected to a central device, which [blank_start]co-ordinates[blank_end] all traffic. If a connection fails, the whole network is not [blank_start]affected[blank_end]. It is also easy to [blank_start]add[blank_end] new computers to the network.
Bus: each computer is connected to a [blank_start]single cable[blank_end] and data can travel in both directions like a [blank_start]bus[blank_end] route. It is easy to set up, simple to [blank_start]add[blank_end] more computers, but if the [blank_start]central cable[blank_end] fails the whole network fails.