Question 21
Domain 2: Design Resilient ArchitecturesSebuah perusahaan ingin meningkatkan **availability dan performance** aplikasi web mereka yang di-host di multiple AWS regions. Mereka butuh solusi yang bisa: - Route users ke region terdekat berdasarkan network performance - Otomatis failover jika satu region down - Tidak ada DNS propagation delay saat failover Service mana yang tepat?
Correct answer: D
Explanation
AWS Global Accelerator fits because it is an edge networking service for “global” traffic that routes users to the nearest healthy endpoint over the AWS backbone. It also provides health checks and uses static anycast IPs, so failover happens without DNS TTL or “DNS propagation delay.”
Why each option is right or wrong
A. Route 53 latency-based routing dengan health checks
B. Route 53 geolocation routing ke region berbeda
C. CloudFront multi-origin dengan failover
D. **AWS Global Accelerator** — anycast static IP yang secara otomatis route traffic ke endpoint AWS terdekat dan paling healthy via AWS backbone; failover dalam detik tanpa DNS propagation delay karena menggunakan IP routing bukan DNS TTL; support health checks per endpoint
AWS Global Accelerator is the edge networking service designed for global, multi-Region applications: it advertises 2 static anycast IP addresses and uses the AWS global network to route users to the optimal healthy endpoint based on network performance, not DNS resolution. Because endpoint health is checked continuously and traffic is shifted at the IP layer, failover occurs in seconds and is not subject to DNS TTL or propagation delays, which is exactly what the scenario requires.