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Understanding the 2^n-2 formula

Discuss Understanding the 2^n-2 formula in the Networking Help forum on Dev Shed.
Understanding the 2^n-2 formula Networking Help forum discussing issues such as routers, switches, small networks, file sharing etc. Find information for both wired and wireless networks.

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  #1  
Old January 7th, 2004, 05:12 PM
PCJUNKIE PCJUNKIE is offline
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Angry Understanding the 2^n-2 formula
Can any body help me understand how to use the formula 2^n-2 ive just started networking and iam going in for my network + in feb and ive just got the understanding of ip / subneting which was an arsehole ! But still cant find an answer to the formula 2^n-2 they give an eg but no meaning ie 2^8-2=254 hosts . SOME BODY PLEASE HELP ME ! ! ! ! Any other tips for newbies would be nice . Thanks guys . . . . . . . .
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Old January 8th, 2004, 06:31 AM
dbasnett dbasnett is offline
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By convention hostid = 0 refers to the network itself and hostid = all 1's is a broadcast, hence the -2.
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Old January 8th, 2004, 07:01 AM
PCJUNKIE PCJUNKIE is offline
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Hey thanks alot !
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