I am preparing for my CCENT exam and about 3-4 month ago, I had found a method of calculating subnet. Unfortunately I did not bookmark the site and i forgot how to do it.
All I remember is how you start.
You first build that table.
0_____1
1_____2
2_____4
3_____8
4_____16
5_____32
6_____64
7_____128
8_____256
9_____512
10____1024
11____2048
12____4096
There is a 3rd column that you start from the middle after you are done with the first 2.
I dont remember where it starts.
If someone have seen this way of doing it and can explain it properly or link to the site that suggest this method.
Thank you
Benoit Bourgault