What Is a VLAN?
One way to identify a local-area network is to say that all the devices in the same LAN have a common Layer 3 IP network address and that they also are all located in the same Layer 2 broadcast domain. A virtual LAN (VLAN) is another name for a Layer 2 broadcast domain. VLANs are controlled by the switch. The switch also controls which ports are associated with which VLANs. In Figure 9-1, if the switches are in their default configuration, all ports by default are assigned to VLAN 1, and that means all the devices, including the two users and the router, are all in the same broadcast domain, or VLAN.
As you start adding hundreds of users, you might want to separate groups of users into individual subnets and associated individual ...
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