Each VLAN is its own broadcast domain. Individual VLAN connections can be configured by port, IP, or MAC address. VLANs can be configured to support individual groups, departments, or domains. VLANS breakdown the broadcast domains on a network. Each VLAN will have its own range of IP addresses so you can route between them. With VLANs in place you need fewer routers. The router can automatically route between sub interfaces without any additional configuration. Combined with 'trunking' this becomes even more powerful. If additional networked groups need to be added VLANing simplifies that task and reduces the total number of router ports needed.
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