## SUBNETTING EXAMPLE 1 CLASS C

##### Wednesday, October 29, 2008

this is the first example

class c

identify subnet , first and last host of the following ip or what ever it may be

here is the example 1

192.168.12.68 / 25 ***************** 25 bits so ...

firstly count in multiples of 8 till we get 24 .... as one octet has 8 bits right ...

so 8 + 8 + 8 + (1) --------- left ..

rest is the childs play... really .. now go to the table 2 and borrow or tick 1 bit horizontally and vertically so in this case

see the table two and come back you will find number 128 under subnets and 128 under bits ..

so subnet is 128 and bits 128 indicate that difference should be 128 --->we will see this point later

so our subnet is

255.255.255.128

as we all know we need to start any subnet with 0 .. so start it

subnet---------firsthost---------------------lasthost-------broadcast

192.168.12.0------192.168.12.1-----192.168.12.126-----192.168.12.127

(see the difference of 128

which we got in bits )

192.168.12.128-------------------------------

hence in this way it can be determined

the crucial one

bits------128-------64-- ---32--------16--------8------4----2------1

subnets *** *(1 bit vertically)

128 **** *(1 bit horizontally)

192

224

240

248

252

254

255

powers of 2 --------------------------------------- subnets--------------------------------------hosts (-2)

2

4

8

16

32

64

128

256

512

1024

hence in this way it can be determined

more examples to follow .. let me know if this makes sense to anyone

regards

Rakesh