Because SSIDs and their VLANs must be extended at Layer 2, you should consider how they are extended throughout the switched network. Figure 9-4 shows an example ofa single VLAN’s extent in the data plane. Working right to left, follow VLAN 100 as it reaches through the network. VLAN 100 is routed within the distribution layer and must be carried over trunk links to the access layer switches and then to each autonomous AP. In effect, VLAN 100 must extend end to end across the whole infrastructure—some- thing that is considered a bad practice
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