You can configure iDRAC to use any of the ports from this rNDC. Link provided by Young have details on the steps. Once you configure iDRAC to use rNDC ports host also will be able to access the rNDC port configured. Both host and iDRAC will share the port.
My R730XD has the Intel dual-SFP+ X710 NIC (with dual 1G RJ45) and I was wondering if the idrac that's installed can use the active SFP+ port instead of the idrac's dedicated port?
Can the idrac in my r730xd use the 10gig SFP+ port?