Ok, I've read just about all I can take on the subject of subnetting. I know how to calculate back and forth between subnets and masks, but I still don't understand a couple of things:
1. What's the purpose? I've read that it speeds up the network and allows for more security. Neither of these have been explained in more detail, and they aren't very intuitive. On this same subject, isn't it true that if a network is broken into subnets it'll require a router between each subnet, making things more complex(not to mention expensive) So why would I want to do it?
2. There seems to be a conflict about the 255.255.255.128 netmask. Some sites say that this would create 2 subnets with 126 hosts each(which makes sense) others say that this is an invalid mask and that the next valid mask ends with 192, providing only 62 hosts/subnet.Which is true?