Why does BGP work on application layer?

Related questions

1. What is MP BGP in MPLS?
2. What is BGP and how does it work?
3. What is site of origin aka Soo?
4. What is BGP table version?
5. Why we use BGP instead of OSPF?
6. Where is BGP protocol used?
7. What is as override in BGP?
8. What is BGP in networking?
9. What is BGP multihop?
10. How does BGP peering work?

Tags

1. #necessarily
2. #information
3. #reality
4. #point
5. #layer
6. #carrying
7. #purely
8. #application
9. #conventional
10. #itself
11. #perspective
12. #transport
13. #which
14. #protocol
15. #anything
16. #functional
17. #network