Common DNS Records

• A Record: Links a domain to an IPv4 address (e.g., www.example.com -> 192.0.2.1).
• MX Record: Directs email to mail servers for the domain.
• CNAME Record: Points a domain to another domain (e.g., blog.example.com -> example.com).
• NS Record: Specifies which DNS servers handle the domain.
• TXT Record: Stores text info like email verification (e.g., SPF, DKIM).

DNS Caching

• Local Cache: Your computer remembers DNS info to speed up future requests.
• ISP Cache: Your internet service provider might store DNS info for faster access.
• Authoritative Cache: The authoritative server stores DNS info for a set period.

DNS Propagation

When DNS records are updated, changes take time to spread across the internet. This can take from a few minutes to 48 hours.

Conclusion

DNS helps convert website names into IP addresses, making it possible to access websites easily.