Identifying VLANs
Know that switch ports are layer 2–only interfaces that are associated with a physical port. A switch port can belong to only one VLAN if it is an access port or all VLANs if it is a trunk port. You can manually configure a port as an access or trunk port, or you can let the Dynamic Trunking Protocol (DTP) operate on a per-port basis to set the switchport mode. DTP does this by negotiating with the port on the other end of the link.
Switches are definitely pretty busy devices. As frames are switched throughout the network, they’ve got to be able to keep track of all the different types plus understand what to do with them depending on the hardware address. And remember—frames are handled differently according to the type of ...
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