(1) Application oriented principle: the design of LAN should follow the principle of "application oriented", and design LAN on the basis of application.<br>(2) Moderately advanced principle: when designing a network, consideration should be given to meeting the needs of users for network bandwidth in the next few years.<br>(3) Scalability principle: scalability refers to the scalability of network scale and bandwidth, which must be considered in the design.<br>
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