DNS Route 53 and ELB - AWS - Routing Policies

https://medium.com/awesome-cloud/aws-amazon-route-53-routing-policies-overview-285cee2d4d3b

https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html

When you create a record, you choose a routing policy, which determines how Amazon Route 53 responds to queries:

• Simple routing policy – Use for a single resource that performs a given function for your domain, for example, a web server that serves content for the example.com website.

• Failover routing policy – Use when you want to configure active-passive failover.

• Geolocation routing policy – Use when you want to route traffic based on the location of your users.

• Geoproximity routing policy – Use when you want to route traffic based on the location of your resources and, optionally, shift traffic from resources in one location to resources in another.

• Latency routing policy – Use when you have resources in multiple AWS Regions and you want to route traffic to the region that provides the best latency.

• Multivalue answer routing policy – Use when you want Route 53 to respond to DNS queries with up to 8 healthy records selected at random.

• Weighted routing policy – Use to route traffic to multiple resources in proportions that you specify.

• ELB is one of many AWS services that have a regional scope and can span across zones in a given region.
• Other services like Route 53 is global in scope, as shown below, and provides services to multiple Regions.