ANS-C01 Question 410
Select 2Your company hosts a web application using multiple EC2 instances across two AWS Regions: us-east-1 and eu-west-1. You need to configure Route 53 to achieve high availability and low latency for users accessing the application. Additionally, you want to ensure traffic is routed only to healthy endpoints. Which combination of Route 53 configurations should you use to meet these requirements?
- A
Create a Latency-based routing policy with health checks for each EC2 instance in both regions.
- B
Create a Weighted routing policy with health checks and assign higher weights to EC2 instances in the primary region.
- C
Configure a Failover routing policy with health checks to route traffic between the two regions.
- D
Enable Multi-Value Answer routing with health checks for all EC2 instances in both regions.
- E
Use Geo DNS routing to direct users from specific geographic areas to the closest region.
Show answer and explanation
Correct answers: A, C
Explanation
To achieve low latency and high availability, Latency-based routing ensures traffic is directed to the region with the lowest latency for the user. Health checks ensure traffic is only sent to healthy endpoints. Failover routing adds an additional layer of high availability by directing traffic to a secondary region if the primary region is unavailable. Together, these configurations meet the requirements of the scenario.
- A. Correct.
Correct: Latency-based routing ensures that users are directed to the region with the lowest latency, improving the user experience. Health checks ensure only healthy EC2 instances are used as endpoints.
- B. Incorrect.
Incorrect: Weighted routing assigns traffic based on weights rather than latency or health status, which does not meet the requirement for low latency and high availability.
- C. Correct.
Correct: A Failover routing policy ensures high availability by routing traffic to a secondary region if the primary region becomes unhealthy. This complements latency-based routing for high availability.
- D. Incorrect.
Incorrect: Multi-Value Answer routing is used for simple health-based DNS load balancing but does not optimize for latency and is not ideal for this multi-region scenario.
- E. Incorrect.
Incorrect: Geo DNS routing directs traffic based on geographic locations but does not optimize for latency or include health checks, which are required in this scenario.