The dissertation, at first, introduced the basic principles of VPN technology and its main technology tunnel technology and encryption technology.
本文首先介绍了VPN的基本原理及其主要技术：隧道技术和加密技术。
The dissertation, at first, introduced the basic principles of VPN technology and its main technology tunnel technology and encryption technology.
本文首先介绍了VPN的基本原理及其主要技术：隧道技术和加密技术。
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