VLSM stands for Variable Length Subnet Mask where the subnet design uses more than one mask in the same network which means more than one mask is used for different subnets of a single class A, B, C or a network.
Let’s suppose we want to subnet my 192.168.2.0/24 network in the most efficient way as:
One subnet for 12 hosts.
One subnet for 44 hosts.
One subnet for 2 hosts.
One subnet for 24 hosts
Means you have to use only one single subnet 192.168.2.0/24 and calculate or divide different subnets for the above requirement.
When using VLSM, make sure you start with the biggest subnet first or you will have overlapping address space.
Subnet 1: (size of 64) network address: 192.168.2.0 broadcast address: 192.168.2.63 Subnet 2: (size of 32) network address: 192.168.2.64 broadcast address: 192.168.2.95 Subnet 3: (size of 16) network address: 192.168.2.96 broadcast address: 192.168.2.111 Subnet 4: (size of 4) network address: 192.168.2.112 broadcast address: 192.168.2.115 Because we have different subnet sizes, we need to calculate the subnet mask for each subnet.
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