You have deployed a web application targeting a global audience across multiple AWS Regions under the domain name example.com. You decide to use Route53 Latency-Based Routing to serve web requests to the users from the region closest to them. To provide business continuity in the event of server downtime, you configure weighted record sets associated with two web servers in separate Availability Zones per region.

Answer options:

A.Latency resource record sets cannot be used in combination with weighted resource record sets.
B.You did not set up an HTTP health check to one or more of the weighted resource record sets associated with the disabled web servers.
C.The value of the weight associated with the latency alias resource record set in the region with the disabled servers is higher than the weight for the other region.
D.One of the two working web servers in the other region did not pass its HTTP health check.
E.You did not set “Evaluate Target Health” to “Yes” on the latency alias resource record set associated with example.com in the region where you disabled the servers.

Answer - B & E
Option A is incorrect because you can set up weighted record sets as the failover or secondary recordset.
Option B is CORRECT because if the HTTP health check is not set with the weighted resource record sets of the disabled web servers, Route 53 will consider them healthy and continue to forward the traffic. Once the health check is enabled, the DNS queries will get a response indicating that the web servers are disabled, and then the requests would get routed to the other region.
Option C is incorrect because even if the weight is lower for the region with disabled web servers, Route 53 will continue forwarding the users` requests closest to that region because it will evaluate the latency record set first.
Option D is incorrect because, even if one of the servers fails, the other server will still work, and the region should get the traffic.
Option E is CORRECT because if the “Evaluate Target Health” is not set to “Yes” for the region containing the disabled web servers, Route 53 will consider the health of the recordset as healthy and continue to route the traffic to it.
For more information on How Amazon Route 53 chooses records when Health Checking is configured, please visit the link below:
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/health-checks-how-route-53-chooses-records.html
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover-complex-configs.html#dns-failover-complex-configs-eth-no