network segment which NIDS can detect?

["SB CH" <chulmin2 () hotmail com>]

Hello, all.

I installed snort NIDS at my switch and I confirmed that snort can detect 
some other servers were attacked. As I know, NIDS can detect some other 
attacks in the range of network segment.
Then what is a "same network segment" in the switch?
I can detect some attacks to A server, but B isn't which use same switch 
connected.

I would like to setup Distrubuted NIDS(D-NIDS) using snort and I have 
operated some switches.
Where can I setup snort NIDS to use D-NIDS?

Thanks in advance.

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