在安装多个入侵侦测系统和多重路由器来袭交通，以减少呛点。
Install multiple intrusion-detection systems and multiple routers for incoming traffic to reduce choke points.
这种结构很浪费：各业务部门产生了很多重复工作，开发相类似的路由器就是一个例子。
This had become wasteful: the lines of business duplicated a lot of work, for instance by developing similar routers.
通过在物理层之上的逻辑层中定义路由，可以在相同网络结构上实现许多重叠的拓扑。
With routing defined in a logical layer above the physical network, it is possible to have many overlapping topologies implemented on the same network fabric.
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