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A developer is charged for data transfer between EC2 instances in the same region. What is the likely cause?

medium📝 Debug Q7 of 15
AWS - Cost Optimization
A developer is charged for data transfer between EC2 instances in the same region. What is the likely cause?
AInstances are in different Availability Zones
BInstances are in the same subnet
CInstances use the same private IP addresses
DInstances are in the same AZ and subnet
Step-by-Step Solution
Solution:

  1. Step 1: Understand intra-region transfer costs

    Data transfer between different Availability Zones in the same region is charged.

  2. Step 2: Validate other options

    Same subnet or AZ transfers are free; IP address conflicts do not cause charges.

  3. Final Answer:

    Instances in different Availability Zones cause data transfer charges -> Option A

  4. Quick Check:

    Cross-AZ transfer = Charged [OK]
Quick Trick: Cross-AZ transfers cost money, same AZ are free [OK]
Common Mistakes:
  • Assuming same region means free transfer
  • Ignoring AZ boundaries
  • Confusing IP address issues with cost

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