This statement is incorrect. The administrative (native) VLAN on a switch should not be left at the default which is usually VLAN 1. It is a security best practice to change the native VLAN to an unused VLAN ID to mitigate VLAN hopping attacks.
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What are VLAN hopping attacks?
What does 'changing the native VLAN' entail?
What are the best practices for VLAN configuration?