You are Cisco Express Foundation Design Specialist in a company. You just properly configured
multiple VLANs, Which three steps are required to secure VLAN network? (Choose three.)
A.
If a port is connected to a foreign device make sure to disable CDP, DTP, RPR, PAgP, UDLP
B.
Enable root guard feature
C.
Configure VTP domains appropriately or turn off VTP altogether
D.
Disable all unused ports and place them in an unused VLAN.