Microsoft Certified Systems Engineer (MCSE) Question:

Subneting is a process of breaking the network into smaller units. These units care called as subnets. Here a subnet could be several machines in a single LAN. Networks using IP can create sub networks of logical addresses. With every IP address there some of the bits in the machine can be used to identify a specific subnet. The IP address then contains three parts: the network number, the subnet number, and the machine number