Which of the following is a not a recommended Private IP range that should be used when defining your internal VPC’s.

Answer options:

A.10.0.0.0 - 10.255.255.255
B.20.0.0.0 - 20.255.255.255
C.172.16.0.0 - 172.31.255.255
D.192.168.0.0 - 192.168.255.255

Answer - B
When the VPC is created, the following private IPv4 address ranges should be used as specified in RFC 1918
· 10.0.0.0 - 10.255.255.255 (10/8 prefix)
· 172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
· 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
For more information on VPC and Subnets, please visit the below link:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html