This paper put great emphasis on research on IPSec,ssl,data link layer encryption ,etc. And the realization methods to IPSec were given out in Windows 2000 and Cisco networks.

• 着重对IP Sec技术以及安全套接层 (SSL)、数据链路层加密等网络安全技术进行了研究 ,并给出IPSec在Windows 2 0 0 0和Cisco中的实现方法