若手ネットワーク エンジニアは、ネイティブ ネットワーク ID をデフォルト以外の値に変更して、ネットワーク環境全体に一貫して適用できるようにしようとしています。エンジニアが防止しようとしている問題は次のうちどれですか?
正解:C
VLAN hopping is a security vulnerability that allows an attacker to move from one VLAN to another without authorization. This can be done by sending a frame with a double VLAN tag. The first tag is the native VLAN of the attacker's port, and the second tag is the VLAN that the attacker wants to access. The native VLAN is the VLAN that is used for untagged frames. By changing the native VLAN to a non-default value, the engineer can make it more difficult for an attacker to send frames with double VLAN tags.