SAA-C03 Q203 · DNS

Question

A company is deploying an application in three AWS Regions using an Application Load Balancer. Amazon Route 53 will be used to distribute traffic between these Regions. Which Route 53 configuration should a solutions architect use to provide the MOST high-performing experience?

Accepted Answer

**A: Create an A record with a latency policy** is correct for two reasons:

1. **Latency-based routing** directly measures and optimizes for performance. Route 53 maintains a database of latencies between users' locations and AWS Regions. When a DNS query arrives, Route 53 routes the user to the Region with the **lowest network latency** — which is exactly what 'MOST high-performing experience' means.

2. **A record (Alias)** is the correct record type for an ALB. An ALB is an AWS resource that has a DNS name (not a static IP), and Route 53 **Alias A records** can point directly to ALB endpoints. Alias records resolve at the DNS level with no additional lookup, are free of charge for queries, and support the zone apex.

**How it works step-by-step:**
- User in Tokyo queries the domain → R

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