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Difficulty: MediumData Transfer Cost Optimization

A company operates a microservices application split across two VPCs (VPC A and VPC B) in the same AWS Region. VPC A hosts the front-end API gateway, and VPC B hosts the backend database services. Approximately 30 TB30\text{ TB} of data is transferred monthly between VPC A and VPC B. Currently, the VPCs are connected using an AWS Transit Gateway, which has caused a significant increase in the monthly AWS bill due to data processing charges. Which of the following strategies should a SysOps administrator implement to minimize data transfer costs while keeping the traffic entirely within the AWS private network? (Select TWO.)

  1. Establish a VPC Peering connection between VPC A and VPC B, and route the traffic between the VPCs through the peering connection.Answer
  2. Ensure that the resources in VPC A and VPC B that communicate with each other are deployed in the same Availability Zone.Answer
  3. C
    Deploy NAT Gateways in each Availability Zone of VPC A and VPC B, and route the traffic between VPCs through the NAT Gateways.
  4. D
    Create an Interface VPC Endpoint (AWS PrivateLink) in VPC A pointing to a Network Load Balancer in VPC B, and route all traffic through the endpoint.
  5. E
    Configure a Gateway Load Balancer endpoint in VPC A to distribute traffic to the backend database instances in VPC B.

Answer

Establish a VPC Peering connection between VPC A and VPC B, and ensure that the resources in VPC A and VPC B that communicate with each other are deployed in the same Availability Zone.
Establishing a VPC Peering connection eliminates the $0.02\$0.02 per GB AWS Transit Gateway data processing charges since VPC Peering has no processing fees. Furthermore, ensuring that communicating resources are deployed in the same Availability Zone eliminates the cross-AZ data transfer charge of $0.01\$0.01 per GB, reducing the data transfer cost for this traffic to zero.

Step-by-Step Solution

1
Analyze the current network architecture and pricing model.
AWS Transit Gateway charges $0.02\$0.02 per GB for data processing in the same region. For 30 TB30\text{ TB} of data, this results in $600\$600 per month in Transit Gateway data processing fees.
Understanding current costs helps identify the most cost-effective alternative.
2
Evaluate alternative private connectivity options.
VPC Peering has no data processing fees, making it $0\$0 per GB for data processing. Compared to Transit Gateway and AWS PrivateLink (Interface Endpoints, which charge $0.01\$0.01 per GB), VPC Peering is the most cost-effective transport mechanism.
VPC Peering provides direct routing between VPCs without intermediate processing costs.
3
Optimize the placement of resources across Availability Zones.
Data transfer over VPC Peering is free if both the source and target resources reside in the same Availability Zone. If they reside in different Availability Zones, a charge of $0.01\$0.01 per GB applies for both egress and ingress.
Aligning resources in the same Availability Zone eliminates cross-AZ data transfer fees, reducing the variable cost to zero.

Key Concept

Minimizing AWS intra-region data transfer costs by using VPC Peering instead of Transit Gateway and matching Availability Zones to avoid cross-AZ fees.
Estimated Time:1m 30s
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Topics

Data Transfer Cost Optimization

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