A hub, a switch, a router. They are all what you have described. A hub is a central point of a computer network. A switch is a series of ethernet ports with no wireless functionality. A router can have both wireless and wired capabilities, but can also have a modem built in.
It is called a Star topology
Star Topology
Bus
Each point of a polygon at which two sides intersect is called VERTEX
Each point is called a vertex.
It is simply called a point on the graph, or a solution to the equation represented by the graph.
bus topology
This point is called critical point.
absolute value
A star network.
entente and central powers
They each have a central point of view -- CNN has a left leaning, Fox, a right or republican slant.