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Answer: The option to evaluate target health is disabled for the latency alias resource record set associated with the domain in the Region where the web servers were stopped., HTTP health checks have not been configured for one or more of the weighted resource record sets linked to the web servers that were stopped.
The failure of Route 53 to redirect users to the other Region when all web servers in one Region are stopped can be attributed to two primary issues. Firstly, if the 'Evaluate Target Health' setting is not enabled for the latency alias resource record set in the affected Region (Option D), Route 53 cannot determine if the endpoints are healthy and thus fails to redirect traffic. Secondly, without HTTP health checks configured for one or more of the weighted resource record sets associated with the stopped web servers (Option E), Route 53 cannot accurately detect the failure and reroute the traffic appropriately. Both these conditions are necessary for Route 53 to perform effective health-check based failover.
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A solutions architect has deployed a web application across two AWS Regions using a custom domain and Amazon Route 53 with latency-based routing. Weighted record sets are associated with pairs of web servers in separate Availability Zones within each Region. During a disaster recovery scenario, when all web servers in one Region are stopped, Route 53 fails to redirect users to the other Region. What could be the underlying issues causing this failure? (Select two possible causes.)
A
The weight assigned to the Region where the web servers were stopped is greater than the weight assigned to the other Region.
B
An HTTP health check for one of the web servers in the secondary Region has failed.
C
The use of latency resource record sets in combination with weighted resource record sets is not supported.
D
The option to evaluate target health is disabled for the latency alias resource record set associated with the domain in the Region where the web servers were stopped.
E
HTTP health checks have not been configured for one or more of the weighted resource record sets linked to the web servers that were stopped.