What is time to live in DNS?

Related questions

1. What are TXT records commonly used for?
2. How do I view DNS records?
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4. Do I need reverse DNS?
5. How long does an a record take to update?
6. How does DNS TXT record work?
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8. What is SRV record in Active Directory?
9. How do records work?
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Tags

1. #changed
2. #their
3. #nameserver
4. #common
5. #hours
6. #seconds
7. #change
8. #still
9. #value
10. #after
11. #which
12. #could
13. #servers
14. #showing
15. #around
16. #older
17. #authoritative
18. #record
19. #world
20. #86400
21. #would
22. #cache