A.Verify that trunked links are configured to allow the VLAN traffic.
B.Verify that the switch is configured to allow for trunking on the switch ports.
C.Verify that each switch port has the correct IP address space assigned to it for the new VLAN.
D.Verify that different native VLANs exist between two switches for security purposes.

A.Verify that different native VLANs exist between two switches for security purposes.
B.Verify that the VLAN was added on all switches with the use of the show vlan command. 
C.Verify that the switch is configured to allow for trunking on the switch ports.
D.Verify that each switch port has the correct IP address space assigned to it for the new VLAN.