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Home > Archive > CCNA > November 2000 > Subnet Woes
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| I need some major help with breaking ip addresses into bits and figuring the subnet out of bits for ABC. Totally lost.. someone please help | |
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| Have no fear, once you learn how to do it, its a piece of cake  Give this site a try, I learned a bunch from them!!!
http://www.learntosubnet.com/ | |
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| For one thing, there's no need to try and figure such things as subnets and broadcast addresses in you brain by doing bit-to-bit computations.
I've been to that website and it's pretty good. But, I think you need to understand how a mask works. Masks in the subnet world use a logical AND operation to compare each bit in the IP address with the corresponding bit in the subnet mask. The result of an AND operation is a 1 only if both corresponding bits are a 1, otherwise, it's a 0. You can use the calculator that comes with Windows set to scientific mode and see how this works.
But again, there's no reason to try and do this mentally bit-by-bit. Memorize these binary values:
128 = 10000000
192 = 11000000
224 = 11100000
240 = 11110000
248 = 11111000
252 = 11111100
254 = 11111110
255 = 11111111
Lammle's 640-507 really does a good job of how to compute subnet stuff without trying to do binary math.
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| if you have questions about subnetting, please visit www.mcsefreak.com/subnetting.htm for an easy "how to subnet" guide!
This is the way I teach TCP/IP for my students and they seem to find it easy to understand...
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Freak, MA, M.Ed., Net+,I-Net+, MCP+I, MCSE, MCT
http://www.mcsefreak.com
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