AWS Certified SysOps Administrator – AssociateNetworking and Content DeliveryMedium
A SysOps administrator needs to configure a highly available and scalable DNS solution for an application running on EC2 instances behind an Application Load Balancer (ALB). The solution must route traffic based on latency to the nearest region and perform health checks on the endpoints. Which AWS service should be used?
- AAmazon Route 53 with Latency Routing Policy
- BAmazon Route 53 with Simple Routing Policy
- CAmazon CloudFront with origin failover
- DAWS Global Accelerator with custom routing
Show answer & explanationAnswer & explanation
Correct answer: A. Amazon Route 53 with Latency Routing Policy
Amazon Route 53's Latency Routing Policy is specifically designed to route user requests to the AWS Region that provides the lowest latency for the user. It also supports health checks to determine the availability of endpoints, redirecting traffic away from unhealthy ones. This perfectly matches the requirements for highly available, latency-based routing with health checks.
Why the other options are wrong
- B. Simple routing policy is for single resources or multiple resources with no health checks or advanced routing logic.
- C. CloudFront is a CDN for content delivery and caching, not a primary DNS service for latency-based routing of application traffic to ALBs.
- D. AWS Global Accelerator improves performance by directing traffic to optimal AWS edge locations over the AWS global network, but Route 53's Latency Routing Policy is the primary DNS service for latency-based routing with health checks.
Route 53 Routing Policies
Different strategies used by Amazon Route 53 to determine how DNS queries are responded to, enabling various traffic management capabilities.
- Simple: Default, basic DNS.
- Latency: Routes to region with lowest latency.
- Failover: Routes to primary, falls back to secondary on failure.
- Geolocation: Routes based on user's geographic location.
Memory trick: Route 53: Your DNS traffic cop, policies guide the way.