Overlay Network is a virtual network which based on existing networks. It is composed of some logical links between service nodes and nodes distributing on the autonomy domains of the Internet .
Overlay网络即覆盖网络,它是建立在现有网络上的一层虚拟网络,由分布在Internet各自治域上的一些覆盖节点和节点之间的逻辑链路组成。
参考来源 - 基于Overlay网络的QoS问题研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Within the logic level the characteristics of a system are described by logical links and their timing properties.
在逻辑门级，系统的特性使用逻辑链路和它们的时间属性。
Nodes in the virtual network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network.
虚拟网络中的节点可以认为是由虚拟或逻辑链接连接起来的，每个都对应一个路径，可能在底层网络通过多个逻辑链接。
Furthermore, there is a logical connection or link between information elements handled at the various stages in different documents, but tool support for navigating these links is at best limited.
此外，在不同文档中的各个阶段处理的信息元素之间存在逻辑连接或链接，但导航这些链接的工具支持充其量不过是有限的。
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