• IANA delegates organisations to take care of the different registries (.net, .io, .com etc)
  • PIR is responsible for .org
• IANA takes care of root DNS zone
• Global service, single database, Globally resilient
• Zone files are created by AWS when registering a domain, it’s a database containing all the details about a domain
• A hosted zone hosts DNS records (within AWS) & can be public, or private (linked to one or more VPCs )
• Managed Name Servers
  • Name Servers are how DNS delegation works
  • CNames can only point to other hostnames, & not IP address. eg, ftp.example.com (CNAME) -> example.com (A record) -> IPv4 address

Route 53 architecture

• How Shuffle sharding helps Route 53 achieve that 100% SLA