What is double tagging VLAN?

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Tags

1. #really
2. #enabled
3. #double
4. #first
5. #transmits
6. #attack
7. #because
8. #member
9. #frame
10. #tagging
11. #interface
12. #without
13. #attacker
14. #connected
15. #prepends
16. #forwarded
17. #tagged
18. #native
19. #trunk
20. #externally