A solutions architect is reviewing a company's AWS architecture to identify cost optimization opportunities. The architecture consists of a multi-tier application deployed across two Availability Zones. The architect notices high cross-AZ data transfer costs. Which TWO strategies can help reduce these specific costs? (Select TWO.)

Answer options:

Keep traffic within the same Availability Zone where possible.

Use public IP addresses for communication between EC2 instances in different AZs.

Use Amazon ElastiCache to cache database queries locally in each AZ.

Replace the Application Load Balancer with a Network Load Balancer.

Enable Cross-Zone Load Balancing on the Application Load Balancer.

How to approach this question

Identify ways to minimize traffic crossing the AZ boundary. Keep traffic local and cache data.

Full Answer

A,C

Data transfer between Availability Zones incurs a per-GB charge. To optimize this, architectures should be designed to keep traffic within the same AZ when possible (e.g., web server in AZ-A talks to app server in AZ-A). Additionally, implementing a caching layer (like ElastiCache) in each AZ reduces the need to fetch data from a database located in a different AZ.

Common mistakes

Choosing 'Enable Cross-Zone Load Balancing'. While good for even distribution, it explicitly causes traffic to cross AZ boundaries, increasing costs.

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Practice the full AWS SAA-C03 Practice Exam 1

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