On what type of network would you use BNC connectors?

There were 3 methods of using ethernet. At this point only the hub with cat5 wiring is being used. The two older methods were a. use of a very thick coax cable with each station employing a tranceiver and a tap into the coax. and b. thinner coax cables with BNC connectors daisy chained from station to station. Called 10base2. So this is an obselete 10M ethernet network.