Here is information on each type, choose whichever works best for your situation:
http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/cli/config/guide/2-0/b_Cisco_UCS_C-Series_CLI_Configuration_Guide_201/b_Cisco_UCS_C-Series_CLI_Configuration_Guide_201_chapter_01000.html
NIC Mode
The NIC mode setting determines which ports can reach the Cisco IMC. The following network mode options are available, depending on your platform:
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Dedicated—The management port that is used to access the Cisco IMC.
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Shared LOM—Any LOM (LAN on Motherboard) port that can be used to access Cisco IMC.
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Shared LOM 10G—Any 10G LOM port can be used to access the Cisco IMC.
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Cisco Card—Any port on the adapter card that can be used to access Cisco IMC. The Cisco adapter card has to be installed in a slot with Network the Communications Services Interface protocol support (NCSI).
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Shared LOM Extended—Any LOM port or adapter card port that can be used to access Cisco IMC. The Cisco adapter card has to be installed in a slot with NCSI support.
Typically we use the port labeled "M" for CIMC management connection and use LOM ports for data, etc.
HTH,
Wes