VLAN

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  • VLANs segregate subnets, but subnets are not securely isolated.
  • 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.