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VLAN Domains Now that we've explored configurations and other housekeeping aspects of Cisco Operating System, and we've defined what a VLAN is, we can return to our focus on layer 2 level operations and VLANs. You'll learn what two types of links can exist on a switch, and what their functions are. We'll also explain how to determine if a port on one switch is only an access link, and how devices at the end of a switch become part of the VLAN.