Why is it difficult to scale networks based on either a pure bus or pure star topology?
Both the shared bus and star network are sharing a single resource (either the bus or the central router), as the network grows its grows harder to to increase the capacity of that single resource. One can see this if we imagine the Internet as a shared bus, with millions of computers all sharing a single coaxial cable or as a star network with the same millions all connected to an unbelievably powerful central computer.
