The network is reliable;(网络是可靠的)Latency is zero;(延时为0)Bandwidth is infinite;(带宽是无限的)The network is secure;(网络是安全的)Topology doesn't change;(网络的拓扑结构是不变的)There is one administrator;(有一名管理员)Transport cost is zero;(传输成本为0)The network is homogeneous.(网络是同种类的)