VLSM: is kind of dividing a major network into multiple subnets with different subnet masks. For example, major network 172.16.1.0 can be divided into subnet 172.16.1.0/25, 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 or 26 are all greater than 16 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 have 192.32.0.0/13, 192.64.0.0/13 (i.e, 13 <24)
RIPv2 supports VLSM but does NOT support CIDR
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1 comment:
what is the reason for having smaller mask value using CIDR than the normal classful mask value for that ip?
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