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VLSM: is kind of dividing a major network into multiple subnets with different subnet masks. For example, major network172.16.1.0 can be divided into subnet172.16.1.0/25,172.16.1.128/26,172.16.1.192/26. But remember the mask bits number of the each subnet must be greater than the classful mask bits (i.e. In this case,25 or26 are all greater than16 so it is acceptable)CIDR: it does not care about classful network. The mask bit number of subnet can either smaller or greater than the classful mask bits number. For example, using CIDR, we can have192.32.0.0/13,192.64.0.0/13 (i.e,13 <24)
