VLSM (Variable Length Subnet Mast)
CIDR(CLassless Inter-Domain Routing)
Using CIDR, any address range is not predifined in terms of class A,B,C,D, but instead requires a mask similar to subnet mask, called a CIDR mask. The core Internet routers must be able to interpret and process masks in addition to network numbers. This combination of numbers, called a network prefix. Routers use prefix(/) to describe how many bits are network bits.
Which works by joining multiple numerically adjacent IP prefixes into a single shorter prefix(called aggregation or summary) that covers more address...