1. DNS concepts
   1. Top-Level Domains
      1. .com
      2. .net
   2. Domain Names
      1. aws.amazon.com
   3. Hosts
      1. api.example.com
      2. ftp.example.com
      3. files.example.com
   4. Subdomains
      1. difference between host
   5. FQDN
   6. Name Servers
   7. Zone Files
   8. DNS.jpg
2. Record Types
   1. A and AAAA
      1. map a host to an IP address
   2. CNAME
   3. MX
   4. NS
   5. ...
3. Route 53 Overview
   1. Domain registration
   2. DNS service
      1. translate domain names into IP addresses
   3. Health checking
   4. Hosted Zones
      1. private
         1. route traffic for a domain and its subdomains within one or more VPCs.
      2. public
         1. route traffic on the Internet
      3. CNAMEs are not allowed for hosted zones in Route 53
   5. Routing Policies
      1. Simple
      2. Weighted
      3. Latency-Based
      4. Failover
      5. Geolocation