What is DNS?¶

• DNS stands for Domain Name System which translates the human friendly hostnames into the machin IP addresses
  • www.google.com => 172.217.18.36
• DNS is the backbone of the internet
• DNS uses hierarchical naming structure
  • .com
  • example.com
  • www.example.com
  • api.example.com

DNS Terminologies¶

• Domain Registrar: Amazon Route 53, GoDaddy...
• DNS Records: A, AAAA, CNAME, NS, ...
• Zone File: contains DNS records
• Name Server: resolves DNS queries (Authoritative or Non-Authoritative)
• Top Level Domain (TLD): .com, .us, .in, .gov, .org...
• Second Level Domain (SLD): amazon.com, google.com, ...

How DNS Works¶