N10-009 · Question #450
N10-009 Question #450: Real Exam Question with Answer & Explanation
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.
Question
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?
Options
- AVTP update
- BPort security issue
- CLLDP misconfiguration
- DNative VLAN mismatch
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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