Question: how to add vmnic to esxi?
Answer: Login to vSphere client and navigate to vSphere host's networking. ... 
Select the physical network adapter. ... 
Select an existing switch option and browse to find the existing virtual switches. ... 
Click on the “+” to assign the new NIC to vSwitch1.It will open a popup window to choose the NIC. ... 
Select the new NIC and click OK.