VLAN Overview - ICND2 04

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Figure A


VLANs

  • Logically groups users.
  • Segments broadcast domains.
  • Subnet correlation.
  • Access control.
  • Quality of service.
  • Total number of VLANs is 4096.


Trunk ports generally carry all VLAN information or at least multiple VLANs.


VLAN = Broadcast Domain = Subnet


Normal Switches

  • Have a single collision domain per port.
  • Broadcasts are sent to all ports.
  • One subnet per LAN.
  • Very limited access control.


Flexibility of VLANs

  • Segmentation of users without routers.
  • Not limited to physical location.
  • Tighter control of broadcasts.


Figure B



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