They are both considered tunneling protocols –because they create a "virtual tunnel" by applying much needed encryption.
他们都认为隧道协议，因为他们创建一个“虚拟隧道”运用急需的加密技术。
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。
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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