After a networking intern plugged in a switch, a significant number of the users in a building lost connectivity. Which of the following is the most likely root cause?

The correct answer is A. VTP update. When the new switch joined the VTP domain with a higher configuration revision number, it propagated its (likely empty or incorrect) VLAN database to all switches. This overwrote the existing VLAN information and caused widespread connectivity loss.

Submitted by packet_pusher· Mar 6, 2026Network troubleshooting

Question

Options

AVTP update
BPort security issue
CLLDP misconfiguration
DNative VLAN mismatch

How the community answered

(62 responses)

A
82% (51)
B
10% (6)
C
5% (3)
D
3% (2)

Explanation

When the new switch joined the VTP domain with a higher configuration revision number, it propagated its (likely empty or incorrect) VLAN database to all switches. This overwrote the existing VLAN information and caused widespread connectivity loss.

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