In this section, we are going to be learning about the configuration of VLANs and some of their characteristics in Cisco IOS Catalyst switches. When configuring Ethernet VLANs, keep in mind that Ethernet VLAN 1 uses only default values. This means that you cannot change the default values assigned to VLAN 1 as illustrated in the output below:
Default VLAN 1 may not have its MTU changed.
Default VLAN 1 may not have its . . .
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