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Method to calculate subnet mask

For 128, Binary is 10000000, we categories this binary as,
NetID: 1 (1’s One)
HostID: 7 (7’s Zero)

Number of PCs:
Formula:
2^ Host ID -2= PC
2^7-2=126 PC

Number of Network:
Formula:
2^Net ID=Network
2^1=2

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  1. Hello Folks,
    Practising basketball I bunked my lectures and now I'm having exames...and I don't know any thing about Networks....badly screwed.Surfing net I came across this site and discovered that the method of calculating subnet mask taught here is very simple and easy to understand.It would surely help me in the network's paper.

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