SAA-C03 Q283 · Networking

Question

A company deployed an application in two AWS Regions. If the application fails in one Region, traffic must fail over to the second Region. The failover must avoid stale DNS client caches, and the company requires one endpoint for both Regions. Which solution meets these requirements?

Accepted Answer

AWS Global Accelerator satisfies every requirement in this question:

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

**2. Avoids stale DNS client caches:** This is the critical differentiator. Global Accelerator provides **two static anycast IP addresses** that never change. Clients connect to these fixed IPs, and Global Accelerator handles routing at the network layer (Layer 3/4) via the AWS global network. Because the IP addresses never change, there is **no DNS TTL or caching problem**. Even if a Region fails, the same IPs route traffic to the healthy Region inst

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