How do routers learn routes?

Related questions

1. What is DPI in networking?
2. Can firewalls be hacked?
3. Can ISP see my passwords?
4. How does DPI SSL work?
5. Why you should use SSL inspection?
6. Does deep packet inspection work on VPN?
7. Can Wireshark capture https traffic?
8. What is TTL in networking?
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Tags

1. #statically
2. #other
3. #networks
4. #interface
5. #through
6. #configured
7. #these
8. #protocols
9. #directly
10. #learned
11. #dynamic
12. #dynamically
13. #connected
14. #remote
15. #routers
16. #routing
17. #address
18. #activated
19. #route
20. #routes
21. #either