What is Q in Q VLAN tagging?

Related questions

1. What is the maximum VLAN ID?
2. Is native VLAN untagged?
3. What is the purpose of VLAN frame tagging?
4. What does tagged VLAN mean?
5. What is CFI in VLAN tag?
6. What is VLAN tagging?
7. What is the difference between trunk and access port?
8. What is VLAN double tagging?
9. What is 802.1 p tagging?
10. What is a VLAN tag group?

Tags

1. #technique
2. #customers
3. #simple
4. #ethernet
5. #layer
6. #receives
7. #dot1q
8. #pretty
9. #customer
10. #frames
11. #metro
12. #providers
13. #provider
14. #tunneling
15. #unique
16. #often