Reducing cross-region data transfer costs
WHAT IT TESTS: data egress cost awareness. OUTLINE: identify cross-region, cross-AZ, and internet egress; co-locate chatty components; add VPC endpoints, CDN caching, and compression. RED FLAG: assuming all transfer is free or ignoring NAT gateway egress.
WHAT IT TESTS: whether you understand where cloud data transfer charges originate and how architecture reduces them. ANSWER OUTLINE: identify the costly paths, namely cross-region traffic between us-east-1 and us-west-2, cross-AZ chatter, internet egress through NAT gateways, and traffic to services over the public internet; mitigate by co-locating chatty components in one region or AZ, using VPC/Gateway endpoints to keep S3 and DynamoDB traffic off NAT and the internet, fronting outbound content with a CDN, and compressing payloads.
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- #cloud
- #networking
- #cost-optimization
- #data-transfer
- #vpc
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