The only right answer here is B , but then the questions is wrong because: Change the Native VLAN to and unused VLAN , is a method use to mitigate VLAN double-tagging attack not a VLAN hopping attack witch is mitigated by turning off DTP this is done by :switchport nonegotiate and switchport mode trunk/access .
Changing the native VLAN to an unused VLAN ID helps protect a network from VLAN hopping attacks. VLAN hopping is a type of attack where an attacker sends frames from one VLAN into another VLAN by exploiting the way some switches handle VLAN information. Changing the native VLAN to an unused VLAN ID helps mitigate this risk by making it more difficult for an attacker to gain unauthorized access to different VLANs.
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