Check NIC status

esxcfg-nics -l

root@NLAM0C0VSHE00:~] esxcfg-nics -l
Name    PCI          Driver      Link Speed      Duplex MAC Address       MTU    Description                   
vmnic0  0000:1a:00.0 bnxtnet     Up   10000Mbps  Full   bc:97:e1:46:40:36 1500   Broadcom BCM57416 NetXtreme-E 10GBASE-T RDMA Ethernet Controller
vmnic1  0000:1a:00.1 bnxtnet     Down 0Mbps      Half   bc:97:e1:46:40:37 1500   Broadcom BCM57416 NetXtreme-E 10GBASE-T RDMA Ethernet Controller
vmnic2  0000:01:00.0 ntg3        Down 0Mbps      Half   bc:97:e1:46:40:34 1500   Broadcom Corporation NetXtreme BCM5720 Gigabit Ethernet
vmnic3  0000:01:00.1 ntg3        Down 0Mbps      Half   bc:97:e1:46:40:35 1500   Broadcom Corporation NetXtreme BCM5720 Gigabit Ethernet
vmnic4  0000:86:00.0 ixgben      Up   10000Mbps  Full   00:1b:21:c6:1c:b0 1500   Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
vmnic5  0000:86:00.1 ixgben      Up   10000Mbps  Full   00:1b:21:c6:1c:b1 1500   Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection
vusb0   Pseudo       cdce        Up   100Mbps    Full   70:b5:e8:c9:17:9b 1500   DellTM iDRAC Virtual NIC USB Device