Answer / jitendera sinha

ok
according to you you have 70 computer in your org
that is
2^n-2>=70
that is 7 bit minimum reqirment for that host

so if you use class c address then mask should be
255.255.255.128/25
let if you are using 192.168.16.0/25 series ip
then you should give

default-gateway-192.168.16.1/25
and you can assign up to 192.168.16.126
this fulfill you requirement without wasting of soo much ip and some ip will be also available for future

this is the concept of vlsm but i am highly recommended that before assigning ip you should check what is the configuration of your network devise.
which class of ip is configured therer
u shuld provide ip according to yours conf

Answer / jm

you can use class c address. 192.168.0.0/16

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