Best Videos or Tutorials For Subnetting

tmcg

This is one area I am not vere strong in, however I would like to master it as eventually I will take the CCNA. Any suggestions would be appreciated

kohr-ah

Let me see if I can dig up one of the sites I used to use.

I always remember it like this.

Subnet mask subtracted from 256 gets me my ranges.
Example: 192.168.1.x 255.255.255.240
Subtract 240 from 256 and you get 16
So 192.168.1.0 - 15
192.168.1.16 - 31
And so on. Then just subtract 2 for hosts range.

Wild cards? Do the same thing but subtract from 255
255.255.255.240 means 15 so 0.0.0.15 would be the wild card