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I am trying to do a lab in Packet T and i get the following error.RB(config)#int g0/1RB(config-if)#ip address 192.168.20.66 255.255.255.0RB(config-if)#ipv6 address 2001:DB8:ABCD:4::1/64RB(config-if)#no shutRB(config)#int g0/0RB(config-if)#ip address ...