【摘要】 局域网是目前使用比较多的网络之一。如何定量地分析网络的原理，无论是研究者，还是学习者都是重要的。建立虚拟网络实验室，是当前网络研究与设计的先进方法。本文以局域网为例，用面向对象方法建立了一个虚拟局域网模型。重点介绍了建立这种模型所需要的类以及类所包含的主要变量和方法，同时也充分考虑了它的扩展性和实用性。然后，实现了一个小型的虚拟以太网。更多还原

【Abstract】 LAN is one of the networks, which is used frequently now. How to quantitatively analyze the network’s principles is important to researchers or studiers. Currently, establishing a simulating network laboratory is an advanced method to research or study network. The paper illustrates how to create a LAN simulating model by oriented-object method. It introduces the classes needed to build the model framework, the major variables and the methods needed to constitute those classes. The method also considers its expansibility and practicability. Then, it simulates a small virtual Ethernet．更多还原