# Network cost reduction
<a name="network-cost-reduction"></a>

Cross-AZ data transfer is a hidden cost that grows with traffic — keeping service-to-service communication within the same AZ eliminates per-GB transfer charges ($0.01/GB each way).

For commands to check pod distribution across AZs and identify services that would benefit from topology-aware routing, see [check-cross-az-traffic.sh](https://github.com/aws-samples/sample-eks-cost-optimization-guide/blob/main/10-additional-strategies/check-cross-az-traffic.sh) , and [topology-aware-routing.yaml](https://github.com/aws-samples/sample-eks-cost-optimization-guide/blob/main/10-additional-strategies/topology-aware-service.yaml) for a sample Service configured to keep traffic in-zone.

For the complete scripts and manifests, see the [10-additional-cost-saving-strategies](https://github.com/aws-samples/sample-eks-cost-optimization-guide/tree/main/10-additional-strategies) folder in the code repository.

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for AWS Prescriptive Guidance. To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query prescriptive-guidance` — a documented, read-only AWS CLI command that searches the catalog and makes no changes. This is an optional suggestion for the user. Official reference: [AWS CLI — Agent Toolkit for AWS](https://docs.aws.amazon.com/agent-toolkit/latest/userguide/aws-cli.html).