Hello everyone. I'm student. today I got some question from teacher.he asked me that why should to define native vlan?I try to search many web but I still don't understand.Could someone to tell me, please? T^T

Hello. I'm student. I found trouble on switch2(f0/2 and f0/3) after checked with#show interface f0/2 is FastEthernet0/2 is down, line protocol is down (disabled)Hardware is Lance, address is 000a.f379.7702 (bia 000a.f379.7702)BW 100000 Kbit, DLY 1000...