In general network structure, there are two kinds of choices: two-layer network and three-layer network. They're logical<br>The classification of topological structure does not mean the data link layer and network layer in ISO seven layer model, but refers to the core<br>Layer, convergence layer and access layer. But there is no convergence layer in the layer 2 network. Because the two-tier network has only core layer and access layer,<br>Therefore, this mode is easy to operate. Generally, it is only used to build small LAN. Different from the two-tier network structure<br>Yes, a three-tier network structure can be used to make up a large network. This paper also uses three-layer network topology to design.<br>
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