ANS-C01 Question 43
Select 2You are designing a highly available architecture for a web application hosted in multiple AWS regions. The application uses Amazon Route 53 to route traffic to instances in Amazon VPCs within these regions. You also need to ensure that if one region becomes unavailable, traffic is automatically routed to the next available region. Which combination of configurations in Route 53 and VPC would fulfill these requirements?
- A
Configure Route 53 with a failover routing policy and health checks for the endpoints in each region.
- B
Use Route 53 geolocation routing to direct traffic based on the geographic location of the users.
- C
Set up VPC peering between the VPCs in different regions to ensure connectivity.
- D
Enable Route 53 health checks on the application endpoints in each region to monitor availability.
- E
Configure Route 53 with multi-value answer routing for distributing traffic across regions.
Show answer and explanation
Correct answers: A, D
Explanation
To meet the requirements for high availability and automatic failover, you must use a Route 53 failover routing policy in combination with health checks. Health checks determine the availability of endpoints in each region, enabling Route 53 to redirect traffic to a secondary region when the primary region becomes unavailable. While other options like geolocation routing and multi-value answer routing serve different purposes, they do not address the need for failover across regions.
- A. Correct.
Correct: Failover routing policy in Route 53 ensures traffic is routed to a secondary region if the primary region becomes unavailable. Health checks are critical for determining endpoint availability.
- B. Incorrect.
Incorrect: Geolocation routing directs traffic based on the user's location, not the availability of regions. This does not meet the requirement for failover in case of regional unavailability.
- C. Incorrect.
Incorrect: VPC peering enables network connectivity between VPCs but does not assist in traffic routing or failover at the DNS level.
- D. Correct.
Correct: Health checks are necessary to monitor the availability of endpoints in each region and trigger failover when a primary region becomes unavailable.
- E. Incorrect.
Incorrect: Multi-value answer routing is used for distributing traffic across multiple healthy endpoints, but it does not provide an automatic failover mechanism between regions.