Question: what is the difference between default vlan 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). ... In terms of encapsulation, Default VLAN is seen to support both DOT1Q and ISL encapsulations. On the contrary, Native VLAN only exists in DOT1Q encapsulation type.