Many organizations need more flexibility to define logical groups of nodes within a LAN. There are many reasons to create subsets of LANs, or subnets. These reasons include:
Separate network segments that use different technologies—Subnets allow Ethernet, wireless, and other LAN technologies to have groups of addresses within the organization’s address space.
Create security groups—Subnets make it easy to logically group nodes by functional use or type of access needed. This feature allows security administrators to limit permissions to nodes within a particular subnet address ...
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