I'm sorry if my question is stupid or off the topic.

I'm a newcomer of OSPF, I'm reading rfc2328 to learn how OSPF works.
I met some problem to understand the content , would you please do me
a favor to do some help ?

1. What's the difference between NBMA mode and P2MP mode?
     ATM is mentioned as NBMA network, but as I know, if an switch
     in ATM network want to communicate with multiple switches/Host
     it must setup multiple SVCs . While P2MP also need such action.

2. Why OSPF use peer router interface address as stub network for point
to point
     connection? In this mode, can the interfaces of the two router
belong to two
     subnet ?

Thank you very much.

James Shen

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