单级网络拓扑发现包括网络层拓扑发现和链路层拓扑发现两个方面。
Network topology discovery is composed of network layer topology discovery and link layer topology discovery.
阐述了网络层拓扑发现与数据链路层拓扑发现之间的区别，分析了数据链路层拓扑发现的研究现状和存在的不足。
The difference of topology discovery between the network layer and the data link layer is described and the development and defect of the data link layer are analyzed.
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