Subnetting

Learning subnetting is much easier that it looks. All you need is basic understanding of  IP Addressing and Maths

 Formulas Of Subnetting

 1. Number of Valid Host (2n-2) Where n is number of Host bits (0's)
2. Number of Valid Network (2y) Where y is number of borrowed Network bits   (1's)
NOTE : With ip-subnet command we can use 1st & last ip
NOTE : Block size remain same for all classes

 Learn the following table or save it for solving subnetting much faster.
 

Wild Card is always 1 less then block size.
Example :

\30 Wildcard will be (Block size -1) (4-1) =3

\30= 0.0.0.3

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