Virtual Local Area Networks (VLANs) are defined as separate broadcast domains, which are local to the switch and controls broadcast, multicast, unicast, and unknown unicast frames. They are defined in an internal database (VLAN.dat) of the switch. The desired ports of a switch can be assigned to the VLANs as per the requirements. VLANs are assigned numbers for identification within a switch or among other switches in the topology. They have a variety of parameters that can be configured to identify them from each other, such as type, name, and state. There are some VLANs that are reserved for special purposes.
The following figure illustrates the hierarchical network diagram of Cisco's hierarchical architecture, where VLANs are generally implemented in the access layer where end users are connected. The network with IP addresses...