Cisco 200-125 Exam

Which statement about DTP is true?

  • A. It uses the native VLAN.
  • B. It negotiates a trunk link after VTP has been configured.
  • C. It uses desirable mode by default.
  • D. It sends data on VLAN 1.
Answer: Option D.
Explanation: 

Disabling Dynamic Trunking Protocol (DTP)
Cisco’s Dynamic Trunking Protocol can facilitate the automatic creation of trunks between two switches. When two connected ports are configured in dynamic mode, and at least one of the ports is configured as desirable, the two switches will negotiate the formation of a trunk across the link. DTP isn’t to be confused with
VLAN Trunking Protocol (VTP), although the VTP domain does come into play.DTP on the wire is pretty simple, essentially only advertising the VTP domain, the status of the interface, and its DTP type. These packets are transmitted in the native (or access) VLAN every 60 seconds both natively and with ISL encapsulation (tagged as VLAN 1) when DTP is enabled.

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