Attackers can exploit native VLAN settings through double-tagging. They send a frame tagged with the native VLAN, containing an inner tag for a target VLAN. The first switch strips the outer tag because it matches the native VLAN. The second switch sees only the inner tag and forwards to the target VLAN. To prevent this, use a dedicated native VLAN that carries no user traffic.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/network-design/switching-and-vlans/native-vlan-security
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░████████████████████████████████████████████████████████████████████████████████████