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Networking, vland and subnet

Posted on 2012-09-21
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What is the difference between a VLAN and a subnet ?
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Question by:Los Angeles1
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woolmilkporc earned 2000 total points
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A VLAN is kind of a subnet on the physical layer, as opposed to IP subnets on layer 3.

A VLAN is implemented on VLAN-aware devices by adding a "tag" field to the packet headers.

VLANs can be used to isolate  traffic on shared switch interconnections (trunks), so that data for multiple VLANS can be transported over a single trunk.

If combined one-to-one with layer 3 subnetting  VLANs can be used to create multiple layer-3 subnets on a single physical layer-2 hardware, thus building multiple broadcast domains in an environment which would otherwise form a single broadcast domain.
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