In Tom Lammle's book it seems as if the subnet chapter is a little confusing at times and this is why
1) At some times it seems that the practice problems assume ip-subnet zero is in effect, and that you do not subtract 2 from your total subnets to get your valid subnets. However, in his VLSM examples he does subtract 2 from his total subnets to get valid subnets2) All of the subnetting sites always subtract 2 from your total subnets to get your valid subnets.
So that part that confuses me, is what should I do for the CCNA exam? Subtract 2, or always assume ip-subnet zero is in effect?
I am new to subnetting so this makes it even more difficult.. haha, I seem to be able to recall the info. Powers of 2, binary math, block sizes, etc. But I have a HUGE problem actually applying the information. When I am presented with actual problems I seem to forget everything and dont know where to begin.. ugh..
Any help would be mucho appreciated...
TIA