Variable-Length Subnet Masks
Until now, we have practiced subnetting using FLSM (Fixed-Length Subnet Masks).
This means that all of the subnets use the same prefix length.
VLSM (Variable-Length Subnet Masks) is the process of creating subnets of different sizes, to make your use of network addresses more efficient.
VLSM is more complicated than FLSM, but it's easy if you follow the steps correctly.
Steps
Assign the largest subnet at the start of the address space.
Assign the second-largest subnet after it.
Repeat the process until all subnets have been assigned.
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