How do DNS servers get updated?

Related questions

1. Can you have a Cname and a record?
2. Can an A record have multiple IP addresses?
3. What is Cname in networking?
4. Can you have more than one cname record?
5. What is a SPF record for DNS?
6. What is a Cname redirect?
7. What is the difference between Cname and Alias?
8. Will changing nameservers affect my website?
9. Can you have two Cname records?
10. How do I create an SPF TXT record?

Tags

1. #other
2. #words
3. #across
4. #propagation
5. #change
6. #information
7. #period
8. #service
9. #nodes
10. #called
11. #hours
12. #provider
13. #domain
14. #update
15. #world
16. #internet
17. #their
18. #caches
19. #effect
20. #nameservers