Network math
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[edit] Binary
Binary is the number system that is in base 2. Numbers used here are 1s and 0s. An example of a binary number would be 1010001010100101. The number on the far right is 1. Then 2, then 4, then 8. I am sure you see the pattern here.
128 64 32 16 8 4 2 1
This may seem like a useless factoid, but is actually quite important, if not crucial, in calculating subnet masks and in considering the address bus of a PC.
[edit] Hexadecimal
Hexadecimal is the number system that is in base 16. The characters in hexadecimal go from 0-9 and then past 9 would be A-F. So when one wants to count past 9, instead of going to 10, one would go to A then B then C etc. Usually, binary is converted to hexadecimal to make data more compact. A6E9 is more human readable than 1010011011101001.
