quick question about SNAP

[exkor5000]

Hi

Can anybody briefly explain what is SNAP and what is it used for??

I understand how a datalink layer protocol implementing the LLC sublayer portion would use multiplex and dimultiplex frames to/from the appropriate network layer protocols using the DSAP and SSAP field. However I don't see how SNAP falls into this picture (after diging Wikipedia and IEEE docs) and why would I even borther using it.

Thanks

[#2]

this frame originated as an Ethernet V2 from the NULL Organizationally Unique Identifier contained within the SNAP Header and therefore translates it back to the original Ethernet V2 format SNAP encapsulation on Ethernet: