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Exam AWS-SysOps topic 1 question 170 discussion

Exam question from Amazon's AWS-SysOps
Question #: 170
Topic #: 1
[All AWS-SysOps Questions]

A user has created a subnet in VPC and launched an EC2 instance within it. The user has not selected the option to assign the IP address while launching the instance. The user has 3 elastic IPs and is trying to assign one of the Elastic IPs to the VPC instance from the console. The console does not show any instance in the IP assignment screen. What is a possible reason that the instance is unavailable in the assigned IP console?

  • A. The IP address may be attached to one of the instances
  • B. The IP address belongs to a different zone than the subnet zone
  • C. The user has not created an internet gateway
  • D. The IP addresses belong to EC2 Classic; so they cannot be assigned to VPC
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Suggested Answer: D 🗳️
A Virtual Private Cloud (VPC) is a virtual network dedicated to the user's AWS account. A user can create a subnet with VPC and launch instances inside that subnet. When the user is launching an instance he needs to select an option which attaches a public IP to the instance. If the user has not selected the option to attach the public IP, then it will only have a private IP when launched. If the user wants to connect to an instance from the Internet, he should create an elastic IP with VPC. If the elastic IP is a part of EC2 Classic, it cannot be assigned to a VPC instance.
by awscertified at March 5, 2020, 1:43 a.m.
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e47cf49
6 months, 3 weeks ago
EC2-Classic doesn't exist any longer.
upvoted 1 times
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jerry19
3 years, 5 months ago
Answer D Elastic IP addresses If your account supports EC2-Classic, there's one pool of Elastic IP addresses for use with the EC2-Classic platform and another for use with your VPCs. You can't associate an Elastic IP address that you allocated for use with a VPC with an instance in EC2-Classic, and vice- versa. However, you can migrate an Elastic IP address you've allocated for use in the EC2-Classic platform for use with a VPC. You cannot migrate an Elastic IP address to another Region. To allocate an Elastic IP address for use in EC2-Classic using the console Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/. In the navigation pane, choose Elastic IPs. Choose Allocate new address. Select Classic, and then choose Allocate. Close the confirmation screen. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-classic-platform.html#differences-ec2-classic-vpc
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