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For questions about Virtual LANs (VLANs) which are used to divide what otherwise would be a single OSI layer-2 broadcast domain into multiple, logical OSI layer-2 broadcast domains.

Virtual LANs (VLANs) are used to divide what otherwise would be a single OSI layer-2 broadcast domain into multiple, logical OSI layer-2 broadcast domains.

VLANs are like any OSI layer-2 broadcast domain:

  • VLANs are not necessarily tied to a single physical device.
  • VLANs are bounded by OSI layer-3.
  • Traffic from one VLAN to another VLAN must be routed at OSI layer-3 (for example by an IP router).

VLANs are most commonly used with Ethernet, where they are a variation on the frame format.

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