Regions and Availability Zones and Edge Locations and so on …

Regions and Availability Zones are key components of cloud computing infrastructure. Regions are geographically distinct areas containing multiple data centers, while Availability Zones are isolated locations within a region, designed to provide high availability and fault tolerance for cloud services.

Edge locations are data centers that are part of Amazon CloudFront, which delivers cached content of AWS services with reduced latency to users.

Direct Connect creates a Layer 3 network connectivity between your on-premises network and the AWS global network through a private link.

Types of Data Transfer and Associated Costs

Like everything else in the AWS universe, data transfer pricing is convoluted. I have tried to simplify various scenarios and associated rough costs.

  1. Between Internet and AWS cloud
    1. Data entering in from the Internet: Free
    2. Data going out to the Internet: Region specific, tiered pricing. For Oregon, it starts at $0.09/GB for first 10 TB.
    3. Data going out to the Internet from edge location: Region specific tiered pricing. For example - Data going out to the Internet from edge location in US is charged at a rate of $0.085/GB.
  2. Within AWS Cloud
    1. Between different AWS regions: It is charged at the source region rates. For most regions, it is $0.02/GB. You should check AWS official pricing for pricing at your source region.
    2. Between an AWS region and a Direct Connect location: No charges when data is moving into an AWS region, but charges do apply when moving from a region to a Direct Connect location. For example - transferring the data from the Frankfurt region into the Montreal Direct Connect link costs $0.03/GB.
    3. Between edge location and AWS regions: Transfers from AWS regions into Edge locations are free. Transfers from Edge locations back to their origin are charged at region specific rates
    4. With in same AWS region, but different AZ (or even different VPC in same AZ): Both ingress and egress will be charged at $0.01/GB. So, a total of $0.02/GB.
    5. With in same AWS region and same AZ
      1. Using public IP addresses: Both ingress and egress will be charged at $0.01/GB. So, a total of $0.02/GB.
      2. Using private IP addresses: Free

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