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Exam ANS-C00 topic 1 question 321 discussion

Exam question from Amazon's ANS-C00
Question #: 321
Topic #: 1
[All ANS-C00 Questions]

You work for a company that has several instances running with automatically assigned public IPs. You performed an upgrade that required you to restart the instances from the console and your DNS records don't work anymore. What happened?

  • A. Your network interfaces need to be reinitialized
  • B. You need to restart Route 53
  • C. Restarting too many instances at once overloads the system
  • D. The instances changed their public IP addresses on restart
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Suggested Answer: D 🗳️
Automatically assigned public IPs change on stop or termination of an instance.

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wahlbergusa
Highly Voted 3 years, 7 months ago
This question does not make sense. Reboot/restart does not change the IP of an instance -> https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html
upvoted 7 times
kirrim
3 years, 7 months ago
Agree with wahlbergusa, the auto-assigned public IP stays with the instance over a restart, per the document he cited, since restarting does not include stopping, hibernating, or terminating the instance: "We release your instance's public IP address when it is stopped, hibernated, or terminated. Your stopped or hibernated instance receives a new public IP address when it is started."
upvoted 1 times
walkwolf3
3 years, 7 months ago
Agreed, also tested restart the instance from AWS console. The instance's public IP kept the same once it's restarted.
upvoted 2 times
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sapien45
Most Recent 3 years, 2 months ago
D. You lost your job, cause you never really understood what was dynamically allocated public IP addresses
upvoted 2 times
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ChauPhan
3 years, 8 months ago
D. The instances changed their public IP addresses on restart
upvoted 1 times
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eeghai7thioyaiR4
3 years, 8 months ago
Ans: D
upvoted 3 times
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