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Home Forums AWS AWS Certified Advanced Networking – Specialty VPC with Public Addressing question

  • VPC with Public Addressing question

  • Lukeb0030

    Member
    October 1, 2020 at 7:46 am

    I got this question in a practice exam, and i had a query about the explanation;

    A Network Administrator launched an Amazon VPC with a primary CIDR block of 34.16.0.0/16 in order to deploy a fleet of Amazon EC2 instances for the company’s high performance computing (HPC) cluster. After a few months, there is no available IP address left in the existing VPC that hinders the launch of new EC2 instances. The Administrator must associate new secondary CIDR blocks to rectify the problem and to improve the scalability of the cloud architecture.

    Which of the following blocks can the Administrator associate to the existing VPC?

    34.17.0.0/16

    172.16.0.0/16

    192.168.0.0/16

    10.0.0.0/16

    ———–

    The correct answer is A: 34.17.0.0/16

    Part of the answer explanation states: If your primary CIDR block is publicly routable (non-RFC 1918), or if it is a CIDR block from the 100.64.0.0/10 range then you are restricted to associating CIDR blocks from the RFC 1918 or the 198.19.0.0/16 range.

    I believe it should say you are restricted *From* associating CIDR blocks from the RFC 1918 or the 198.19.0.0/16 range not #to# because, if I understand correctly, if you setup your VPC with a public CIDR, you can then only add additional public CIDR ranges to that VPC.

    Thanks 🙂 I find these practice exams super helpful, much appreciated !

  • TutorialsDojo-Support

    Member
    October 1, 2020 at 10:36 pm

    Hello Lukeb0030,

    We are happy that you find our practice test helpful.

    Thank you for bringing this up. We have revised the explanation section of this question to make it more clear.

    Let us know if you need further assistance. The Tutorials Dojo team is dedicated to helping you pass your AWS exam!

    Regards,

    Kenneth Samonte @ Tutorials Dojo

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Original Post
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