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Answer Posted / sheshdhar dueby
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CIDR = Prefix length.
VLSM is taking a subnetted address and re-subnetting one of
the subnetted networks.
IE, if you have 192.168.10.0/27, you have networks:
192.168.10.0
192.168.10.32
192.168.10.64
192.168.10.96
etc.
You can take (for example) 192.168.10.32/27, and make it
192.168.10.32/29, thus Varying the Length of the Subnet
Mask. You can now have networks:
192.168.10.32
192.168.10.40
192.168.10.48
192.168.10.56
If we assume 192.168.10.64 is in use, as are all the
addresses that follow in the original /27 scheme, then you
have to stop there. If the .64 address scheme is not being
used you can keep going with the smaller subnet size until
you reach an address that is in use. Obviously you can't
duplicate addresses...
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