What concrete rule or layer of the OSI model should be used to decide whether a network is a point-to-point network or a broadcast network?
A general definition (*) seems clear, but in practice it doesn't seem so simple to me. Can you validate, complete or correct the following cases:
- two PCs: PCA and PCB connected directly by a cable --> p2p network
- two Pcs: PCA and PCB (same VLAN or not) connected by a switch --> broadcast network (due to the switch)
- three PCs: PCA connected directly to PCB connected directly to PCC; PCB has two NICs --> p2p network
- three PCs and 2 switches: PCA -- Switch1 -- PCB -- Switch2 --PCC; PCA connected to PCC via VPN --> p2p network
- two routers: directly connected to each other --> p2p network
- three routers: R1 directly connected to R2 and R3, R2 directly connected to R1 and R3, and therefore R3 directly connected to R1 and R2 --> 3 p2p networks
- three routers linked together by a switch --> broadcast network
Thanks in advance !
(*) A p2p link can only connect two nodes. With a broadcast link (p2mp), more than two nodes can be connected