200-301 Question #833: Real Exam Question with Answer & Explanation

The correct answer is B: CDP. Cisco Discovery Protocol (CDP) must be enabled for the show interfaces trunk command to display native VLAN mismatch information.

Submitted by ngozi_ng· Mar 5, 2026<must be one of the domains listed above>

Question

Which feature or protocol must you enable so that the output of the show interfaces trunk command includes information about native VLAN mismatches?

Options

ARSTP
BCDP
CPortFast
DDTP

Explanation

Cisco Discovery Protocol (CDP) must be enabled for the show interfaces trunk command to display native VLAN mismatch information.

Common mistakes.

A. RSTP (Rapid Spanning Tree Protocol) is used to prevent loops in a switched network and does not provide native VLAN mismatch detection.
C. PortFast is a STP feature that immediately brings an edge port to the forwarding state, bypassing the listening and learning states, and does not relate to native VLAN mismatch detection.
D. DTP (Dynamic Trunking Protocol) is used to negotiate trunking parameters between two Cisco switches and does not report native VLAN mismatches in show interfaces trunk output.

Concept tested. CDP and native VLAN mismatch detection

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-3s/ir-xe-3s-cr-book/ir-cdp-disc-int-xe.html

Topics

#CDP#VLAN trunking#Native VLAN mismatch

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