The Magical art of subnetting

What is subnetting?

A subnet, or subnetwork, is a logical subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting. Computers that belong to the same subnet are addressed with an identical group of its most-significant bits of their IP addresses

This results in the logical division of an IP address into two fields: the network number or routing prefix, and the rest field or host identifier. The rest field is an identifier for a specific host or network interface

The routing prefix may be expressed as the first address of a network, written in Classless Inter-Domain Routing notation, followed by a slash character, and ending with the bit-length of the prefix

First of all, memorise this table

Write down, all of the powers of 2, from 1 to 256,
Then do the same in reverse.
Then write /24 to /32 in the last row.

Say you get a question.

You have a network, 192.168.0.0/24, you need to have as least 4 networks with 50 hosts each, which four subnets are you going to choose?
Your subnet mask would need to be x.x.x.x/26
Take the whole network(Pie), cut into 4 pieces, each piece has 1/4th of the total networks of the initial subdivided networks.

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