A developer is surprised by high data transfer costs. Which misconfiguration is the most likely cause?

medium📝 Debug Q6 of 15

AWS - Cost Optimization

AData transfer from EC2 to the internet using a VPC endpoint

BData transfer from EC2 to S3 in the same region

CData transfer within the same Availability Zone between EC2 instances

DData transfer between EC2 instances in different Availability Zones within the same region

Step-by-Step Solution

Solution:

Step 1: Understand data transfer costs within a region
Data transfer between EC2 instances in different Availability Zones within the same region incurs charges.
Step 2: Evaluate other options
Transfers within the same AZ are free; EC2 to S3 in the same region is free; VPC endpoints reduce internet data transfer costs.
Final Answer:
Data transfer between EC2 instances in different Availability Zones within the same region -> Option D
Quick Check:
Cross-AZ EC2 data transfer costs money [OK]

Quick Trick: Cross-AZ EC2 data transfer incurs charges [OK]

Common Mistakes:

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