A vSphere administrator needs to add redundancy to an ESXi 5.x management network on a
vSphere Standard Switch.
Which method should the administrator use to create redundant management networks?
A.
Configure the management network vSwitch with two active uplinks
B.
Configure an additional management portgroup on the same vSwitch
C.
Create a second management network on a second vSwitch in the same subnet
D.
Create a second management network on the same vSwitch in the same subnet
Explanation:
A is correct
VMware recommends that you add a second vmnic to the service console or management network vSwitch configured with NIC teaming, and that you keep both as active adapters, or place one in standby
http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.avail.doc_50%2FGUID-5E574EB3-85B1-4B75-8E97-F2C580A3E1D1.html
Why is not C?
Creating a 2nd management network (which requires a different IP) does not create redundancy for the first network. You now have two management networks, neither with redundancy and only one can be used at a time.