You are working for a start-up firm, working on a POC project, in which multiple EC2 instances are launched for an internal project to check Web application performance. You need to pre-warm EC2 instances by initiating them into the desired mode & then moving to Hibernate state. You are looking for IP address changes when EC2 instances move from Running state to Hibernate and back to Running state. Which of the following statements is correct?

Answer options:

A.Both Public IPv4 and Private IPv4 addresses are assigned with new IP addresses, whereas any IPv6 address is retained.
B.Only Public IPv4 addresses are assigned with new IP addresses, whereas Private IPv4 and any IPv6 address are retained.
C.Only IPv6 addresses are assigned with new IP addresses, whereas both Private IPv4 and Public IPv4 addresses are retained.
D.All IP addresses assigned to the EC2 instances are released & new IP addresses are allocated to EC2 instances post hibernation.

Correct Answer – B
The instance retains its private IPv4 and any IPv6 addresses when hibernated and started. AWS releases the public IPv4 address and assigns a new one when you start it.
Option A is incorrect as when the EC2 instance is hibernated & restarted, there is no change in the private IPv4 address assigned to the EC2 instance.
Option C is incorrect as when the EC2 instance is hibernated & restarted, there is no change in the public IPv6 address assigned to the EC2 instance.
Option D is incorrect as when the EC2 instance is hibernated & restarted, there is a change in the public IPv4 address assigned to the EC2 instance while no change in the private IPv4 & IPv6 address assigned to the EC2 instance.
For more information on IP Address for EC2 in Hibernate state, refer to the following URL,
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Hibernate.html#instance_hibernate