Exam AWS-SysOps topic 1 question 52 discussion

C. Launch the instances in the Amazon Virtual Private Cloud (VPC). When you launch EC2 instances within a VPC, you have granular control over the network configuration, including the ability to specify the private IP addresses for the instances. You can define a subnet within the VPC and configure the IP address range for that subnet. When launching an instance within the subnet, you can choose a specific IP address from the defined range.

since when is an elastic IP a private IP address?

I'm voting for A. That's sort of the idea of an elastic IP.

Correct Answer: C No doubt about it

What's the correct answer? A or C?

C is the answer In the VPC you can define a cidr range and the instances spun in the associated subnets will assume IPs in that range.

The answer is actually C. https://aws.amazon.com/premiumsupport/knowledge-center/custom-private-primary-address-ec2/

C: "assign each Instance a predetermined private IP address"

A is correct Details: All EC2 can only be launched within VPC. but public and private IP assignments are random within subnet you select. Predefined IP can only be through elastic IP.

A By creating a subnet CIDR you are creating a group of predefined IP address https://forums.aws.amazon.com/thread.jspa?threadID=233469

A : the Good answer The Elástic IP adress is used for that !

this is an odd question... poorly worded... C. Launch the instances in the Amazon virtual Private Cloud (VPC).

I think the question is poorly worded. Where else would you launch EC2 instances if not a VPC?

When you create a VPC, you must assign it an IPv4 CIDR block (a range of private IPv4 addresses)