MY CCIE JOURNEY

moving on to class b

150.200.155.23/18

18 bits .. so multiples of 8 ... now 24 will not work as 18 is less than 24 .. so next 8 multiple is 16 ... so ... we need two more bits from 16 to 18

so go to table two tick two horizontally and two vertically ... and you are done


so seeing the table ... under subnets it stopped at 192.. remember we had only 16 bits now not 24 .. so our mask would be

255.255.192.0

now see under the bits table ... we are stopped at 64 .. so for this we need to have increments of 64 ... as usual start with 0

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

150.200.0.0

150.200.64.0

150.200.128.0----150.200.128.1-------150.200.191.254-----150.200.191.255

our ip statisfies here

150.200.192.0


hence in this way this can be determined




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