What is inner VLAN and outer VLAN?

Related questions

1. What is Vim visual mode?
2. What is double tagging attack?
3. How do I use visual mode in Vim?
4. Why do we need VLAN tagging?
5. What is a tag name?
6. What is encapsulation dot1q?
7. Is VLAN tagging secure?
8. How can VLAN hopping be avoided?
9. What is double tagging VLAN?
10. What is the purpose of VLAN tagging?

Tags

1. #while
2. #values
3. #value
4. #specific
5. #called
6. #range
7. #unambiguous
8. #subinterface
9. #either
10. #accepts
11. #single
12. #inner
13. #always
14. #outer
15. #configured
16. #command