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。
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