AWS Certified Solutions Architect - Associate
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A company hosts its web application on AWS using seven Amazon EC2 instances. The company requires that the IP addresses of all healthy EC2 instances be returned in response to DNS queries.
Which policy should be used to meet this requirement?
Other
Community
UAnonymous
A
Simple routing policy
B
Latency routing policy
C
Multivalue routing policy
D
Geolocation routing policy
Explanation:
Explanation
The correct answer is C. Multivalue routing policy.
Why Multivalue Routing Policy?
Multivalue routing policy is specifically designed to return multiple values (up to 8) in response to DNS queries. It has several key features that make it ideal for this scenario:
- Multiple IP Addresses: Returns multiple resource record sets (up to 8) in response to DNS queries.
- Health Checks: Can be associated with health checks to return only healthy endpoints.
- Load Distribution: Provides basic load balancing by returning different sets of IP addresses to different clients.
Why Not the Other Options?
- A. Simple routing policy: Returns only a single value per DNS query. It doesn't support returning multiple IP addresses.
- B. Latency routing policy: Routes traffic based on the lowest network latency for the end user. It doesn't return multiple IP addresses.
- D. Geolocation routing policy: Routes traffic based on the geographic location of the user. It doesn't return multiple IP addresses.
Key Requirements Met:
- All healthy EC2 instances: Multivalue routing can return up to 8 healthy endpoints.
- Seven EC2 instances: This is within the 8-endpoint limit of multivalue routing.
- Health-based routing: Multivalue routing supports health checks to ensure only healthy instances are returned.
Alternative Consideration:
For more than 8 instances or more advanced load balancing features, you would need to use an Application Load Balancer or Network Load Balancer in combination with Route 53. However, for exactly 7 instances, multivalue routing is the perfect fit.
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