DNS refresher

• Converts Human friendly hostnames to IP
• Hierarchical naming structure
• DNS registrar - Route53, GoDaddy,
• DNS records -
  • A
  • AAAA
  • CNAME
  • NS
• Zone file
• Name server (NS)
• TLD : .com, .gov,.org
• Second level domain : amazon.com
• api.google.com
  • com - TLD
  • google - second level domain
  • app - hostName
• example.com → Local DNS server (Have you seen this address)
• Local DNS Server → Root DNS Server (ICANN) (if local serve has not, it will ask the Root DNS, managed by ICANN)
• ICANN, i havent seen it. .com is NameServer, go see TLD NS server
• Local DNS server will ask TLD NS server . example.com (IP)
• Second Level DNS Server (Amazon Route 53), example.com , A record (IP)
• 3rd party Domain Registrar (Example GoDaddy) — DNS can be managed elsewhere (AWS Route53 Name Servers)
  • Create a public hosted Zone in Route53
  • then update NS records to point to Route52 Name servers

DNS record types