What is the Minimum Size of a Subnet in AWS VPC?

Answer - C.

This is mentioned in the AWS documentation.

The minimum size of a subnet is a /28

For more information on VPC's, please refer to the below link:

In AWS, the minimum size of a subnet that can be created within a VPC (Virtual Private Cloud) is a /28 subnet.

A subnet is a range of IP addresses in your VPC where you can launch Amazon Elastic Compute Cloud (Amazon EC2) instances, RDS instances, and other AWS resources. Subnets are created within a VPC by specifying a range of IP addresses in CIDR notation.

CIDR notation is a shorthand way of representing an IP address and its associated subnet mask. The subnet mask is represented by a forward slash followed by a number, which indicates the number of bits in the subnet mask. For example, a /28 subnet has a subnet mask of 255.255.255.240, which means that it can contain up to 16 IP addresses.

AWS recommends creating subnets that contain at least 16 IP addresses (a /28 subnet) to ensure that you have enough IP addresses to launch resources and to allow for future growth.

Therefore, the correct answer to the exam question is C. /28 is the minimum size of a subnet that can be present in a VPC in AWS.