Cisco 100-105 Exam

Configuration of which option is required on a Cisco switch for the Cisco IP phone to work?

  • 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.
Explanation: 

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.

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