|Yes, I guess both is true depending on how you set it up. You could simply set a range of ports (on a switch that supports it) to belong to a specific VLAN and and use Trunks which is even more secure. |
I have done it the other way where you specify by the MAC which makes it easy to move computers around because no matter what jack they are plugged into they only see the VLAN they belong to. It even looks like there is a Layer 3 VLAN which uses packets. So it looks like it depends on if you are Doing Layer 1,2 or 3 VLANs.
So my argument still stands that they are more secure but you need the equipment to support them where sub netting will work with any equipment.
As for sub netting calculator. It is no more of a cheat than using the cart which without it is is impossible to pass the CCNE because it is timed and to AND GATE all those addresses like the old guys use to do would take for ever.
I use the chart because it is easy to generate from memory and it makes subnetting so much faster.