Domain Name System
Laziness led to Domain = D here.
It's not just 1 system that caches all the millions of sites, something deeper.
It consists of 3 servers:
So, the Auth servers (3rd) store the Ds with their IP addresses. The text instructions to determine the IP address for a specific D are DNS records or zone files.
Let's see some!
- A | AAAA : resolve D to IPv4 | IPv6
- PTR : reverse of 1, check email spams
- CNAME : aka another domain (when typing www.instagram.com, it leads to instagram.com)
- MX : the server to send email to
- NS : name of auth server
- SRV : get service and port number
- TXT : text info about D
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