Q. Show the Direct connection or one to one topology?

In the one to all topology, there is a path between every node and every other node. The number of paths required is defined by the equation

 P = (n2-n)/2, 

where n is number of nodes and P, total number of paths. 

So number of paths increases considerably as number of nodes increases. Every node should be physically able to connect to paths to every other node so a very large connector and associated interface support circuitry is required at each node. Adding a new node requires major rewiring and affects software which manages communications for the system.