A US-based company is expanding their web presence into Europe. The company wants to
extend their AWS infrastructure from Northern Virginia (us-east-1) into the Dublin (eu-west-1)

region. Which of the following options would enable an equivalent experience for users on
both continents?

A.
Use a public-facing load balancer per region to load-balance web traffic, and enable HTTP health
checks.

B.
Use a public-facing load balancer per region to load-balance web traffic, and enable sticky
sessions.

C.
Use Amazon Route 53, and apply a geolocation routing policy to distribute traffic across both
regions.

D.
Use Amazon Route 53, and apply a weighted routing policy to distribute traffic across both
regions.

Explanation:
Geolocation routing lets you choose the resources that serve your traffic based on the
geographic location of your users, meaning the location from which DNS queries originate.
For example, you might want all queries from Africa to be routed to a web server with an IP
address of 192.0.2.111.
Another possible use is for balancing load across endpoints in a predictable, easy-to-manage
way, so that each user location is consistently routed to the same endpoint.
http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html#routingpolicy-weighted