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A user reserved an instance but is charged On-Demand rates. What is the likely cause?

medium📝 Debug Q7 of 15
AWS - EC2 Fundamentals
A user reserved an instance but is charged On-Demand rates. What is the likely cause?
ABilling cycle has not started yet
BReserved Instances always charge On-Demand rates
CUser launched Spot Instances instead
DInstance type or region does not match the reservation
Step-by-Step Solution
Solution:

  1. Step 1: Check reservation matching

    Reserved Instances apply discounts only if instance type and region match the reservation.

  2. Step 2: Understand billing behavior

    If mismatch occurs, On-Demand rates apply despite reservation purchase.

  3. Final Answer:

    Instance type or region does not match the reservation -> Option D

  4. Quick Check:

    Reservation mismatch = On-Demand charges [OK]
Quick Trick: Reservation discount applies only if instance matches [OK]
Common Mistakes:
MISTAKES
  • Thinking Reserved always charges On-Demand
  • Confusing Spot with Reserved
  • Assuming billing delay causes this

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