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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?
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:
A.
Move the database to the public subnet in AZ A.
B.
Use a NAT Gateway in AZ A to route traffic to AZ B.
C.
Deploy web servers and read replicas in both AZ A and AZ B, and configure the application to prefer the local database.
D.
Enable VPC Peering between the subnets.
How to approach this question
Understand that cross-AZ traffic costs money. To avoid it, keep traffic local to the AZ.
Full Answer
C.Deploy web servers and read replicas in both AZ A and AZ B, and configure the application to prefer the local database.✓ Correct
Deploy web servers and read replicas in both AZ A and AZ B, and configure the application to prefer the local database.
Data transfer between Availability Zones incurs charges. By deploying application stacks (web + db replica) in multiple AZs and configuring the app to read from the local AZ database, you eliminate cross-AZ data transfer costs while maintaining high availability.
Common mistakes
Moving everything to a single AZ, which sacrifices high availability.
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