If the recommended number of nodes in a subnet is no more than 512. Why do people mess with the subnetmask to create variable length subnetmasks (private IP's)?
Why not use multiple subnets as below and stick routers in between
With standard subnetmasks you can look at the IP and subnetmask and visually know if two addresses are on the same network. But when using variable length subnetmasks you need to do the working out.
I understand it's useful with public IP's, There must be an advantage in private LANs
Would appreciate someones help