I understand the idea behind vlan hopping, which is that someone can "gain access" to another vlan through sending the double tagged frame or switch spoofing, but what i dont understand is how sending a packet gives them that access? Why does VLAN 20 accepting a packet it shouldnt be receiving give the attacker anything? Wouldnt the vlan just accept the packet and that's that? Once the vlan accepts the packet, how does the attacker have access to the information? I feel like i dont have a proper understanding of what frames being sent across vlans are capable of. Could the frame contain a packet sniffing tool or something? Is that why? Sorry im still learning this stuff
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