ANS-C01 Question 414
Select 3Your company has a global application hosted across multiple AWS regions to ensure high availability and low latency for users. You are tasked with configuring Route 53 to provide reliable DNS resolution and automatic failover in case one region becomes unavailable. Which Route 53 configurations will help achieve this?
- A
Configure Route 53 with a Multi-Value Answer Routing policy to return multiple healthy endpoints for DNS queries.
- B
Use Route 53's Geolocation Routing policy to direct users based on their geographic location.
- C
Set up Route 53 DNS Failover with health checks to automatically redirect traffic away from unhealthy endpoints.
- D
Implement a Weighted Routing policy with Route 53 to distribute traffic evenly across all regions.
- E
Enable Latency-Based Routing in Route 53 to route users to the region with the lowest latency.
Show answer and explanation
Correct answers: A, C, E
Explanation
To ensure reliability in a global application, Route 53 configurations should include mechanisms for redundancy, failover, and performance optimization. Multi-Value Answer Routing provides multiple endpoints, enhancing reliability. DNS Failover with health checks ensures automatic redirection during failures, and Latency-Based Routing optimizes user experience by directing traffic to the closest healthy region. Geolocation and Weighted Routing policies are not specifically designed for reliability or failover scenarios.
- A. Correct.
Multi-Value Answer Routing helps improve reliability by returning multiple healthy IP addresses for each DNS query. If one endpoint becomes unavailable, clients can try another from the list.
- B. Incorrect.
Geolocation Routing directs traffic based on the user's geographic location but does not inherently provide reliability or failover capabilities.
- C. Correct.
DNS Failover with health checks ensures that traffic is redirected from unhealthy endpoints to healthy ones, improving reliability during regional failures.
- D. Incorrect.
Weighted Routing distributes traffic based on assigned weights but does not provide failover or reliability mechanisms in case of endpoint failures.
- E. Correct.
Latency-Based Routing directs users to the region with the lowest latency, which can improve reliability and user experience by avoiding overloaded or distant endpoints.