This paper mainly analyzes and researches the principle and implement mechanism of Dial-Up Networking for Point-to-Point Protocol in Windows 98 OS, and discusses the implement mechanism of Virtual Network Adapter in Dial-Up Networking.

• 着重分析和研究了Windows98环境下拨号网络对数据链路层点对点协议的实现机理；并探讨了拨号网络中虚拟网卡的实现机制.