A company is designing a multi-tier architecture. They want to minimize cross-AZ data transfer costs while maintaining high availability. Which TWO architectural decisions will help minimize these costs? (Select TWO.)

Answer options:

Deploy all resources in a single Availability Zone.

Keep the web and application tier instances in the same Availability Zone where possible.

Use Amazon CloudFront to cache content.

Use a Network Load Balancer instead of an Application Load Balancer.

Replicate the RDS database across three regions.

How to approach this question

Balance HA with cost. Keeping traffic local to an AZ saves money. Caching saves money.

Full Answer

Keep the web and application tier instances in the same Availability Zone where possible., Use Amazon CloudFront to cache content.

Data transfer within the same AZ is free. Designing the application to prefer same-AZ routing between tiers reduces costs. CloudFront reduces data transfer out of the region entirely.

Common mistakes

Choosing single AZ, which sacrifices High Availability.

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