D. Data transfer between Availability Zones. Both A and D would be the free options, but I would choose D since the questions states the company is already using AWS.
A. Inbound data transfer from the internet
Inbound data transfer from the internet to AWS typically doesn't incur any cost. Therefore, transferring the data into AWS from the internet would result in no cost for the company.
Transfer to different region will charge fees, only same region no charges.
Inbound has no charge, therefore this solution should be A
https://aws.amazon.com/tw/blogs/architecture/overview-of-data-transfer-costs-for-common-architectures/
My answer would be D, however the question seems to be misleading
Internal Data Transfers:
Data transfer within the same Availability Zone (AZ) in the same Region for several services like EC2, RDS, Redshift, DAX, and ElastiCache is free. However, this approach requires keeping your data and processing within a specific zone, which might not be feasible for all use cases.
Data Transfer Out of AWS:
Surprisingly, data transfer out of AWS to the internet is free for most services. This means ingesting 2 TB into AWS might incur charges, but transferring it back out wouldn't. However, this only applies to specific scenarios, like downloading data backups or sharing files publicly.
"In most cases, there is no charge for inbound data transfer or for data transfer between other AWS services within the same Region. There are some exceptions, so be sure to verify data transfer rates before beginning."
D. Data transfer between Availability Zones
Data transfer between Availability Zones within the same AWS Region is not charged; hence, transferring data between these zones would incur no additional cost for the company. This transfer occurs across AWS's internal network infrastructure within the same region, making it free of data transfer charges.
Answer - There is no charge for inbound data transfer across all services in all Regions.
Data transfer from AWS to the internet is charged per service.
There is a charge for data transfer across Regions.
Data transfers are free if you are within the same region, within the same availability zone, But use a private IP address, using public IP is chargeable.
C. Data transfer between AWS Regions
Transferring data between AWS Regions over the AWS global network is generally not subject to data transfer costs. AWS provides free data transfer between regions through the AWS backbone.
On the other hand:
A. Inbound data transfer from the internet: Inbound data transfer to AWS from the internet is typically free, but outbound data transfer from AWS to the internet has associated costs.
B. Outbound data transfer to the internet: Outbound data transfer from AWS to the internet usually incurs costs based on the amount of data transferred.
D. Data transfer between Availability Zones: Data transfer between Availability Zones within the same region is generally free, but there may be costs associated with data transfer between Availability Zones in some specific scenarios, such as when using certain services or features. It's important to check the specific details in the AWS pricing documentation for the most accurate information.
C. Data transfer between AWS Regions
Transferring data between AWS Regions over the AWS global network is generally not subject to data transfer costs. AWS provides free data transfer between regions through the AWS backbone.
On the other hand:
A. Inbound data transfer from the internet: Inbound data transfer to AWS from the internet is typically free, but outbound data transfer from AWS to the internet has associated costs.
B. Outbound data transfer to the internet: Outbound data transfer from AWS to the internet usually incurs costs based on the amount of data transferred.
D. Data transfer between Availability Zones: Data transfer between Availability Zones within the same region is generally free, but there may be costs associated with data transfer between Availability Zones in some specific scenarios, such as when using certain services or features. It's important to check the specific details in the AWS pricing documentation for the most accurate information.
"There is no charge for inbound data transfer across all services in all Regions."
https://aws.amazon.com/blogs/architecture/overview-of-data-transfer-costs-for-common-architectures/
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