MY CCIE JOURNEY

this is what i liked in this tutorial.. designing subnets was never been easy for me and also very much confusing .. thanks to the author iam now satisfied with my designing subnets knowledge

192.168.1.0

4 subnets required

each subnet needs at least 10 hosts


firstly for its a class c addr ..so for our subnet mask it should have three octets full ... as class c is 255.255.255.x

so

fill it out as 255.255.255.x

now we need 4 subnets ... so tick till we meet our subnet requirements in the table

now as marked two bits under subnets ...you also need to mark two bits under subnets in the upper colomn



hence in this way this can be determined

as it stopped at 192..our subnet mask is ends with 192..there fore our subnet mask is 255.255.255.192

now as you tick two bits under upper subnets coloum...there are 6 bits remaining unticked right ..(unticked 224 240 248 252 254 255 total 6)

tick them under hosts

look the table and come back ... we are left at 64 ..as we need to subtract two for broadcast and subnets .. there would be 62

solve simply
the crucial one


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

subnets


128-------*

192-------*

224

240

248

252

254

255


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

2--------------------*------------------------------------*

4--------------------*-------------------------------------*

8----------------------------------------------------------*

16----------------------------------------------------------*

32----------------------------------------------------------*

64------------------------------------------------------------*

128


256


512


1024