Understanding the Impact of Deleting a Subnet in AWS

Answer - B.

In AWS, when you try to delete a subnet with instances, it will not be allowed.

The below error message will be shown when u try to delete a subnet with instances.

Hence, option B is the CORRECT answer.

For more information on VPC and subnets, please visit the link.

When a user creates a public subnet within a VPC and launches an EC2 instance within it, the subnet becomes associated with that instance.

If the user tries to delete the subnet, the action will depend on whether the EC2 instance is running or terminated.

If the instance is running, AWS will not allow the user to delete the subnet. This is because a running instance needs a subnet to function, and deleting the subnet would render the instance unusable.

To delete the subnet, the user needs to terminate the EC2 instance first. Once the instance is terminated, the user can delete the subnet.

If the instance is already terminated, the user can delete the subnet without any issues. Deleting the subnet will not impact any other subnets or VPCs, as each subnet and VPC is independent of each other.

Option A is incorrect because deleting the subnet will not automatically make the EC2 instance a part of the default subnet. The user will need to launch the instance in a different subnet.

Option C is incorrect because deleting the subnet will not terminate the instances. As discussed, instances need to be terminated first before deleting the subnet.

Option D is incorrect because a subnet can be deleted independently of the VPC, as long as there are no instances running within it.