1网络设计网络设计在网络建设中占有十分重要的地位，网络设计直接决定了网络的结构、性能、价格和可维护性。在网络设计时，主要考虑了网络的稳定性和价格，即通常所说的性能价格比。因为教学用的网络主要是用于教学，没有必要更多的去追求其先进性。所以在网络设计之初就决定 1 network design Network design occupies a very important position in the network construction, network design directly determines the network structure, performance, price and maintainability. In the network design, the main consideration of the stability of the network and the price, which is commonly referred to as the cost performance. Because the teaching network is mainly used for teaching, there is no need to pursue more of its advanced nature. So at the beginning of the network design decision