Guy I want to know about IP Adreesing/VLSM.
Recently I have an interview. & ask about the same question. But I only answered the HOW part not WHAT & WHY.or you say any peoper defination.
I have also searched on net after that but not found WHAT & WHY part.
As I know How to do on paper all about that.
What is VLSM = the ability to apply different subnet masks to the same major network rather than having to use the same subnet mask.
WHY = because without VLSM you can have very inefficient address allocation eg.
You need a subnet that allows for 60 hosts and a subnet for a point to point link.
60 host subnet = 192.168.5.0/26 or 255.255.255.192.
P2P link wher you only need 2 IP addresses =
And you have wasted 60 addresses.