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.
