- A. PortFast on the interface
- B. the interface as an access port to allow the voice VLAN ID
- C. a voice VLAN ID in interface and global configuration mode
- D. Cisco Discovery Protocol in global configuration mode
Answer: Option C.
The switch has two VLANs: one carries data traffic and one carries voice traffic. The switch port can be either access VLAN or trunk VLAN, but you need to configure a voice VLAN to carry the voice traffic.