I have a confusion... whats really the function of the native vlan? is it the same that trunk?.. if we have configure the trunk interface and not the native vlan, what happen with the native vlan?
Native VLAN is a concept of 802.1q
802.1q is a trunking protocol
They are not the same.
Trunking is the capability to transport multiple VLANs in the same media
Native VLAN is the VLAN that goes untagged across the trunk.
By default if you don't configure a native VLAN, is VLAN 1