Cisco 100-105 Exam

On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor?

  • A. CDP
  • B. RTP
  • C. UDP
  • D. TCP
Answer: Option A.
Explanation: 

The Cisco Unified IP Phone uses CDP to communicate information such as auxiliary VLAN ID, per port power management details, and Quality of Service (QoS) configuration information with the Cisco Catalyst switch.

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