A VLAN is a logical grouping of hosts that appear to be on the same LAN regardless of their physical location. VLANs increase the number of Broadcast domains in a switched network, while reducing their overall size. A VLAN can span a single switch or even multiple switches, depending on the implementation. Troubleshooting intra-VLAN and inter-VLAN connectivity issues is therefore an all-encompassing task that should take several elements into consideration. These elements are described later in the 'Troubleshooting VLANs' section. Catalyst switches support two types of switch VLAN ports, which are access ports and trunk ports. These . . .
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