AWS Certified Solutions Architect Professional SAP-C02 Practice Question

AWS Global Accelerator offers two static anycast IP addresses and continuously probes regional endpoints. When an endpoint or Region becomes unhealthy, Global Accelerator removes it from service in well under one minute and immediately routes new connections to healthy endpoints, so the 30-second objective is met. Because the same static IP addresses are used before and after failover, client devices and corporate firewalls require no DNS updates or configuration changes.

Route 53 DNS failover still depends on recursive resolvers honoring a low TTL; many resolvers cache records longer than the configured TTL, so convergence can exceed the 30-second goal and exposes changing IP addresses. CloudFront origin failover is limited to GET/HEAD/OPTIONS requests and, by default, can spend up to 30 seconds trying the primary origin before switching, which may breach the RTO and does not provide static IPs. Direct Connect is a private network link; shifting traffic between Regions requires BGP route manipulation and cannot guarantee automated failover within the required timeframe. Therefore, deploying AWS Global Accelerator in front of the existing Application Load Balancers is the most reliable and operationally efficient solution.