A startup firm uses AWS VPN to store all documents in the Amazon S3 bucket from their regional office. Due to the huge growth in the number of users accessing Amazon S3, they are facing congestion & performance issues. Client internal users have a mixed IP address assigned with some using IPv4 address& others using IPv6 address. The client needs to ensure both users can efficiently access the S3 bucket without any change in the user end configuration. They are planning to set up an AWS Direct Connect link with dual-stack Public VIF for this requirement. Which of the following IP address ranges ( client`s end IP configuration ) need to be finalized before setting a Public VIF with both IPv4 & IPv6 connections? 

Answer options:

A.Use custom Public IP address pool for both IPv4 & IPv6 connections.
B.Use Private IPv4 pool for IPv4 connection while for IPv6 connection, use custom IPv6 pool from IPv6 range owned by the client.
C.For Public IPv4 & IPv6 connection, an IP address is automatically assigned by Amazon.
D.Use Public IPv4 pool owned by client for IPv4 connection while for IPv6 connection, peer IP addresses are automatically assigned by Amazon.

Correct Answer – D
For Public VIF DX connection, the Client needs to specify the Public IPv4 address pool which they own, while for the IPv6 connection, peer IP addresses are automatically assigned by Amazon from its IPv6 pool.
Option A is incorrect as a custom IPv6 pool cannot be assigned for AWS DX Connection.
Option B is incorrect as a private IPv4 pool cannot be assigned for Public VIF AWS DX Connection.
Option C is incorrect as IPv4 pools are not automatically generated for Public VIF by AWS & need to specify during connection creation.
For more information on creating a Public VIF with IPv4 & IPv6 connection, refer to the following URL
https://docs.aws.amazon.com/directconnect/latest/UserGuide/create-vif.html