SAA-C03 Q505 · Networking

Question

A company deployed an application in two AWS Regions. If the application becomes unavailable in one Region, the application must fail over to the second Region. The failover process must avoid stale DNS client caches. The company wants to use one endpoint to access both copies of the application. Which solution will meet these requirements?

Accepted Answer

**AWS Global Accelerator** meets every requirement:

1. **Multi-Region failover**: Global Accelerator supports endpoint groups in multiple Regions. It performs continuous health checks and automatically routes traffic away from unhealthy endpoints to healthy ones in another Region — providing instant failover.

2. **Avoids stale DNS caches**: This is the critical differentiator. Global Accelerator provides **two static anycast IP addresses** that never change. Traffic is routed at the **network layer (Layer 3/4)**, not via DNS resolution. Because clients connect to the same IP addresses regardless of which Region is serving traffic, there is **zero dependency on DNS TTL or client DNS caches**. When failover occurs, the same IP addresses simply route traffic to the healthy Region through AW

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