IP address allocation occupies an important position in network design and has the greatest impact on the speed of the network system. The general rules of IP address design are simple, manageable, and expandable. The IP address is the network layer logical address used in the TCP/IP protocol suite, which uniquely identifies a node in the network, and the allocation of IP address space should adapt to the network Hierarchy. <br>(1) Uniqueness: no two hosts in an IP network can use the same IP address <br>(2) Simplicity: address allocation should be simple and easy to manage, reducing the complexity of network expansion, and simplifying routing <br>(3) Continuity: consecutive addresses It is easy to summarize the routing in the hierarchical network, greatly reducing the routing table and improving the efficiency of the routing algorithm. <br><br>(4) Scalability: There should be room for address allocation at each level to ensure that with the expansion of the network scale <br>(5) Flexibility: with the help of variable length subnet mask technology, address allocation should be flexible .
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