A. Correct - Additional EIPs associated with one instance incur a charge.
B. incorrect - Once an EIP is associated with an instance, you must manually change the hostname if you want it to match.
C. correct - Once you associate an EIP with an instance, the original public IP is released.
D. correct - Disassociated EIPs incur a charge.
According to https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html, "When you associate an Elastic IP address with an instance that previously had a public IPv4 address, the public DNS host name of the instance changes to match the Elastic IP address." Therefore, B is in-correct. You don't need to change it manually.
Hey All, Please comment for the below
A- I am not sure what additional EIP mean. Is it additional to the 5 free EIPs limit or just a second IP. Since the question didn't specify whether or not the additional IP is beyond the 5 free EIPs then A is a plausible answer (False)
B- If you decided to name your instance with your public IP address after launch, you can do so (But I don't know why anyone would want to do that). Then after your IP is changed with your EIP- then you must change the hostname (EC2 Instance name manually) - doable but very weird. However if the question meant changing public DNS name rather than saying hostname, Public DNS name changes automatically no need for manual intervention. Since there is no mention of DNS name on this can be True.
B - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html#:~:text=When%20you%20associate%20an%20Elastic%20IP%20address%20with%20an%20instance%20that%20previously%20had%20a%20public%20IPv4%20address%2C%20the%20public%20DNS%20host%20name%20of%20the%20instance%20changes%20to%20match%20the%20Elastic%20IP%20address.
D is still a correct statement.
$0.005 per Elastic IP address not associated with a running instance per hour on a pro rata basis
https://aws.amazon.com/ec2/pricing/on-demand/#Elastic_IP_Addresses
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