SAP-C02 Q184 · DR

Question

An environmental company is deploying sensors in major cities throughout a country to measure air quality. The sensors connect to AWS IoT Core to ingest timeseries data readings. The company stores the data in Amazon DynamoDB. For business continuity, the company must have the ability to ingest and store data in two AWS Regions. Which solution will meet these requirements?

Accepted Answer

Answer C addresses every requirement precisely:

**1. Multi-Region IoT Ingestion:**
- **Domain configurations** for AWS IoT Core are created in each Region. This is critical because AWS IoT Core's default endpoints (e.g., `xxxxxx-ats.iot.us-east-1.amazonaws.com`) are region-specific and cannot be used with Route 53 routing policies directly. Domain configurations allow you to create **custom domain names** for IoT Core endpoints, which can then be managed via Route 53.

**2. Failover Routing with Health Checks:**
- A Route 53 **health check** evaluates the health of each IoT Core domain configuration. When the primary Region's IoT Core becomes unavailable, Route 53 automatically fails over DNS resolution to the secondary Region's IoT Core endpoint.
- **Failover routing** (not latency-based

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