The division method based on the network layer is to divide the VLAN according to the network layer protocol. When there are multiple protocols in the network, VLANs can be divided according to different routing protocols, and which VLAN the host belongs to depends on the network protocol it is running on, independent of other factors. This method is relatively rare in practical application, because most of the networks are now running IP protocol hosts, because a network uses a limited number of different network layer protocols, so the number of VLANs is also very small.
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