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This is regarding double-tagging VLAN hopping attack. I read in the CCNP-Security Secure Official Cert ...

i read that a vlan hooping attack with double tagging can also happen, if the attacker did not establish a trunk connection to the first switch. "The frame arrives on the switch, which looks at the first 4-byte 802.1Q tag.

For VLAN hopping attack to happen there are some conditions that should be met, the attacker would need to be connected to a switch port with same VLAN as the native VLAN, the attacker and the victim should be connected to different switches and they should be in two different VLANs. Here is how a VLAN hopping attack would happen.

I am not Security guy but u can use native vlan for "vlan hopping" (i think that's hackers term). Over all, it is bad idea to use Vlan 1 for data traffic (end-user traffic); So, put unused ports into "not- used- for- traffic vlan X"; Or shut unsed ports down. use other vlan as Native vlan - although Not 100% sure if that helps

The vlan hopping is an silent attack, it doesn't generate logs, for that reason, the recommendation is configure the same native vlan on both sides (a vlan without use) and disabled DTP for avoid the attack. Best regards!

The original VLAN hopping attack is using double encapsulated frames like Q-in-Q type frames. Here is a different form of VLAN hopping attack and for the first time someone has finally been able to take a photo as an evidence.

All ports are set to vlan 1 by default and vlan 1 is used by Control traffic (STP, DTP, CDP, etc). So, Management vlan - use to connect to devices by IT -should be something else; Yes, you could shutdown any Unused ports but usually they are moved to different vlan id that would not be use for data traffic (so called "park vlan"); it is easier ...

Double Tagging VLAN Hopping Attack . STP manipulation attack – This attack makes use of the spanning tree protocol and the attacker attaches to a port on the switch either directly or via another switch. The STP parameters are manipulated in order to achieve the status of a root bridge which helps the attacker to see various frames which ...

For VLAN hopping attack to happen there are some conditions that should be met, the attacker would need to be connected to a switch port with same VLAN as the native VLAN, the attacker and the victim should be connected to different switches and they should be in two different VLANs. Here is how a VLAN hopping attack would happen.