AWS SAA-C03 · Question 64 · Domain 4.4: Network Cost Optimization
A company has a multi-tier application. The web servers are in a public subnet in Availability Zone A, and the database is in a private subnet in Availability Zone B. The company notices high cross-AZ data transfer charges. How can they eliminate these cross-AZ data transfer costs while maintaining high availability?
Answer options:
Move the database to the public subnet in AZ A.
Use a NAT Gateway in AZ A to route traffic to AZ B.
Deploy web servers and read replicas in both AZ A and AZ B, and configure the application to prefer the local database.
Enable VPC Peering between the subnets.
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