Question: what is the difference between vlan 1 and native vlan?
Answer: Native VLAN concept exists in case of encapsulation type 802.1Q (802.1Q supports untagged traffic while ISL does not support untagged traffic). ... Lastly, Default VLAN can only be one per switch, and divergent to it, number of Native VLANs can be higher than one since it is equivalent to number of Dot1q trunks on Switch.