# So What Are VLANs?

- VLANs are an extension to switches

- VLANs are “Virtual” LANs - Network Manager Decides Which Machines Are On What Subnets. Machines on the same VLAN will receive broadcast/multicast traffic

- Benefits:
  - The Benefits of Switching with the Functionality of Sharing
  - Reduces Broadcasts/ Focussed Multicasting
  - Greater Throughput

- Outcome:
  - Still Hard To Get Visibility Into What’s Happening
  - Proprietary VLAN protocols

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