Elastic Load Balancers do not supply physical IP addresses as they change frequently – always use DNS name of the ELB provided by AWS ELB.

You setup an alias A type to point to an ELB or a Apex domain (mydomain.com).  Cannot use a CNAME with an Apex domain.

Given the choice on an exam – and practically it is cheaper – always choose Alias over CNAME.

Understand AWS Route 53 routing policies –

  • Simple (no complex policy),
  • Weighted (percentage based),
  • Latency (calculates latency based on Client location),
  • Failover (route all to active),
  • Geolocation (based on where the Client is when browsing),

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