A user has created a VPC with CIDR 20.0.0.0/24. The user has created a public subnet with CIDR 20.0.0.0/25. T

he user is trying to create the private subnet with CIDR 20.0.0.128/25. Which of the below mentioned statements is true in this scenario?

A. It will not allow the user to create the private subnet due to a CIDR overlap

B. It will allow the user to create

a private subnet with CIDR as 20.0.0.128/25

C. This statement is wrong as AWS does not allow CIDR 20.0.0.0/25

D. It will not allow the user to create a private subnet due to a wrong CIDR range

Explanation:

When the user creates a subnet in VPC

, he specifies the CIDR block for the subnet. The CIDR block of a subnet can be the same as the CIDR block for the VPC (for a single subnet in the VPC., or a subset (to enable multiple subnets. If the user creates more than one subnet in a VPC, the CIDR bl

ocks of the subnets must not overlap. Thus, in this case the user has created a VPC with the CIDR block 20.0.0.0/24, which supports 256 IP addresses (20.0.0.0 to 20.0.0.255. The user can break this CIDR block into two subnets, each supporting 128 IP addres

ses. One subnet uses the CIDR block 20.0.0.0/25 (for addresses 20.0.0.0 – 20.0.0.127. and the other uses the CIDR block 20.0.0.128/25 (for addresses 20.0.0.128 – 20.0.0.255.