lan topology

基本解释

Connecting several thousands of computers to a LAN can in theory be done using a star, a ring, or a bus topology.
理论上说，星型、环型、总线拓扑架构都可以将成千上万台计算机连成局域网。
The link layer topology discovery can discover the physical topology internal a LAN, which the network layer topology discovery can not discover.
链路层的拓扑发现能够发现网络层拓扑发现无法发现的局域网内部的详细的物理连接情况。
It's always a good idea to purchase cables that are 1 or 2 times longer than the required length in case the structure (topology) of the LAN changes in the future.
购买网线时最好选择比需要长度多 1 或 2 倍，这样可以应付将来局域网拓扑结构（topology structure）的改变。