What is a VLAN?

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Why VLAN?

  • Local Area Network (LAN) security limitations
  • Inefficient cost with scale

Virtual Local Area Network

  • Defined by two RFCs: IEEE 802.1q and IEEE 802.3ac
  • Allow seperated LAN inside the same media
  • All communication between VLANs go through a router

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VLAN usage example

Source: Wikipedia