Hi Support Team, I have a question if the interconnection of sw (SN2000 series) to server is only Lan or they are also Wan, please help me, thanks.

The Mellanox itself does not terminate a WAN connection. Please see the following link on page 7 for the supported interconnect cabling options for the SN 2000 series:

http://www.mellanox.com/related-docs/prod_eth_switches/BR_SN2000series.pdf

If this does not answer your question, if you can be more specific about what exactly you are trying to connect it would be helpful.

Kevin