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You have an Elastic IP associated with an EC2 instance. You stop and start the instance. What happens to the Elastic IP and the instance's public IP?

hard📝 Application Q15 of 15
AWS - EC2 Fundamentals
You have an Elastic IP associated with an EC2 instance. You stop and start the instance. What happens to the Elastic IP and the instance's public IP?
AThe Elastic IP remains but the instance loses its public IP until reassigned
BThe Elastic IP is released automatically and the instance gets a new public IP
CThe Elastic IP remains associated and the instance keeps the same public IP
DThe Elastic IP dissociates and you must manually re-associate it
Step-by-Step Solution
Solution:
  1. Step 1: Recall Elastic IP behavior on instance stop/start

    Elastic IPs remain allocated and associated with the instance even if it is stopped and started.
  2. Step 2: Understand public IP behavior

    Without Elastic IP, the public IP changes on stop/start, but with Elastic IP, the public IP stays the same.
  3. Final Answer:

    The Elastic IP remains associated and the instance keeps the same public IP -> Option C
  4. Quick Check:

    Elastic IP keeps public IP fixed on stop/start [OK]
Quick Trick: Elastic IP keeps public IP fixed after stop/start [OK]
Common Mistakes:
  • Thinking Elastic IP is released on stop/start
  • Assuming public IP changes despite Elastic IP
  • Believing manual reassociation is needed

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