AWS-DNS

- Name of server that supplied data for the zone

- Admin of the zone

- Current version of the data file

- Number of seconds a secondary name server should wait before checking for updates

- Number of seconds a secondary name server should wait before retrying a failed zone transfer

- Maximum number of seconds a secondary name server can use data before it must refresh or expire

- Default number of seconds for the time-to-live (TTL) file on resource records

NS Records (Name Server Record) - used by top level domain server to direct traffic to the Content DNS server which contains authoritative DNS records

A Records (Address Record) - used to translate domain name to IP address

TTL Record (Time-To-Live Record) - The Length that a record is cached on either the Resolving SErver or the users local PC

CName Record (Canonical Name Record) - Can be used to resolve one domain name to another (jordanviolet.com points to violetfamily.com)

Alias Record

- Works like CName record in that you can map one DNS name to another

- CName can't be used for naked domain names, can't have CName for violetfamily.com, it must be either A Record or Alias

Exam Tips

- ELB do not have pre-defined IPv4 addresses, must resolve using DNS name

- Understand the difference between Alias Record and CName Record

- Given the choice, always choose an Alias Record over CName