Re: HOWTO: Understand Binary and Subnetting

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Re: HOWTO: Understand Binary and Subnetting
by DJ_SA on Wednesday July 09, @03:56PM

Hi everyone out there, Thanx first for the author for writing such an understandable guide... However, I am still not clear about the -2 part in 2^n-2. I can understand -2 basically means to eliminate the first portion of the subnet (e.g. AAA.BBB.CCC.0~) and last portion (e.g. ~AAA.BBB.CCC.254)... but why elinate those two parts of the class? is it not usable? Thanx!

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