Data transfer cost awareness in AWS - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding AWS Data Transfer Pricing Zones

Which AWS data transfer scenario typically incurs the highest cost?

A Data transfer from an EC2 instance in one AWS region to an S3 bucket in a different AWS region

B Data transfer between two EC2 instances in the same Availability Zone using private IP addresses

C Data transfer from an EC2 instance to the internet within the same region

D Data transfer between two EC2 instances in different Availability Zones within the same region

💡 Hint

Consider the cost differences between inter-region and intra-region data transfers.

Data transfer between different AWS regions usually costs more than transfers within the same region or Availability Zone.

❓ Architecture

intermediate

Optimizing Data Transfer Costs Between VPCs

You have two VPCs in the same AWS region. Which option minimizes data transfer costs when instances in these VPCs communicate?

A Use a public internet gateway for communication between instances

B Use VPC peering between the two VPCs

C Use a VPN connection over the internet between the VPCs

D Use AWS Direct Connect to connect the VPCs

💡 Hint

Think about the cheapest way to transfer data within the same region.

VPC peering allows data transfer within the same region at low or no cost compared to internet or VPN connections.

❓ service_behavior

advanced

Data Transfer Cost Behavior with AWS CloudFront

Which statement best describes data transfer costs when using AWS CloudFront to serve content from an S3 bucket?

A Data transfer from S3 to CloudFront is free, but data transfer from CloudFront to users incurs charges

B Data transfer from S3 to CloudFront and from CloudFront to users both incur charges

C Data transfer from S3 to CloudFront and from CloudFront to users are both free

D Data transfer from S3 to CloudFront incurs charges, but data transfer from CloudFront to users is free

💡 Hint

Consider how AWS charges for content delivery networks.

AWS does not charge for data transferred from S3 to CloudFront, but charges apply for data delivered from CloudFront to end users.

❓ security

advanced

Impact of Data Transfer Costs on Security Architecture

You want to secure data transfer between your on-premises network and AWS. Which approach reduces data transfer costs while maintaining security?

A Use a VPN connection over the public internet without encryption

B Transfer data over the public internet without any encryption

C Use a VPN connection over the public internet with IPsec encryption

D Use AWS Direct Connect with a private virtual interface and encrypt data at the application layer

💡 Hint

Think about secure, private connections that reduce internet data transfer costs.

AWS Direct Connect provides a private connection that reduces data transfer costs compared to VPN over the internet, and encrypting at the application layer maintains security.

✅ Best Practice

expert

Designing a Cost-Efficient Multi-Region Architecture

You need to design a multi-region AWS architecture that minimizes data transfer costs for frequent data replication between regions. Which strategy is best?

A Use VPC peering between regions to transfer data directly between EC2 instances

B Use S3 Cross-Region Replication with versioning enabled and replicate all objects immediately

C Use AWS DataSync with scheduled transfers during off-peak hours and compress data before transfer

D Use public internet transfers with encrypted connections between regions

💡 Hint

Consider tools designed for efficient data transfer and cost control.

AWS DataSync allows scheduled, optimized, and compressed data transfers between regions, reducing costs compared to continuous replication or internet transfers.