point-to-multipoint and point-to-multipoint non-broadcast

[Zillah]

Internetwork Expert Lab for CCIE says:

"Another two configurable network types that are left
are therefore point-to-multipoint and point-to-multipoint non-broadcast.

Point-to-multipoint non-broadcast is used in NBMA environments with virtual circuits of differing speeds".



Cisco says:

"Cisco IOS offers several options for configuraing OSPF so that it can overcome NBMA limitations, including the OSPF neighbor command, point-to-point subinterfaces, and point-to-multipoint. Which solutions are available to you depend on your NBMA network topology".

Do it mean form the above that we have two types of point-to-multipoint :

1- Broadcast (it does not say explicitly).
2- Non-broadcast (it does say expliciltly).
3- Cisco only mentions one type of point-to-mlutipoint (without specifing if it is broadcast or non-brodcast) ?


"Point-tomultipoint non-broadcast[/b] is used in NBMA environments with virtual circuits of differing speeds".
I did not get why do we do this ?

 

[KiscoKid]

You can have have both types of p2mp networks as you've described - namely broadcast and non-broadcast.

The OSPF neighbor commands are used in NBMA envionments typically.