VLAN
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- VLANs make provisioning, routing subnets easier.
- VLANs make moving physical subnets easier. They can maintain their virtual topology, but be physically relocated.
- VLANs can be created at the layer 2 level (based on MAC addresses) which is simpler but can't cross switches.
- VLANs can be created at the layer 3 level (based on IEEE 802.1q packet tagging) which allows more flexible routing over dumb switches.