Multi-Point Interface VS Point-to-Point Interface

[Iluvnetwork]

1) Router1(f0/0) -- (f0/0)SW1(f0/1-23) -- 23PCS

2) Router1(s0/0) -- (s0/0)Router2(f0/0) -- (f0/0)SW1(f0/1-23) -- 23PCS

3) Router1(f0/0) -- (f0/0)Hub1(f0/1-15) -- 15PCS

I cannot classify whether the specific interface is point-to-point or point-to-multipoint.

First case:

Router1's f0/0 -> Point to Multipoint, SW1's f0/1-23 -> Point to Point

Second case:

Router1's s0/0 -> Point to Point, Router2's f0/0 -> Point to Multipoint, SW1's f0/1-23 -> Point to Point

Third case:

Router1's f0/0 -> Point to Multipoint, Hub's f0/1-15 -> No Idea, best guess is Point to Point

If I am wrong, please let me the correct answers. Plus, somehow I cannot just understand point-to-point/point to multipoint comparison pictures on google. If you know how to distinguish them, please share with me :) I really want to know how to correctly classify whether the specific interface is multi-point or point-to-point.

[Reza Sharifi]

Point-to-point is usually referred to a directly connected link between 2 devices using a /30, /28. etc..

So, in you scenario, case 2, the connections between Router1(f0/0) -- Router2(f0/0)  is point-to-point.

Point-to-point could also be between 2 routers connection using a serial interfaces:                   Router1(s0/0) -- Router2(s0/0). You can't connect 2 devices together using serial on one site and Ethernet on the other side. The media type must be the same.

HTH 

[Iluvnetwork]

I meant Router(s0/0) --- (s0/0)Router2(f0/0)...

I editted the post. There should be no more confusion :)