Defined above is the books VPN, popular speakers, VPN is an encrypted tunnel.
上文是书本上定义的VPN，通俗的讲，VPN是一条加密的隧道。
Connection protocol: This protocol multiplexes the encrypted tunnel to numerous logical channels, running over the User Authentication protocol.
连接协议：该协议多路传输加密隧道到多个逻辑通道，通过用户认证协议运行。
Once a connection to the server has been established (including a connection via a proxy or over a TLS-encrypted tunnel), the client MUST send an opening handshake to the server.
假如开启了安全选项，客户端在打开连接后发送数据前，必须进行TLS握手。
The manager instances route the IPsec tunnel traffic to the data center and act as encrypted switches between the cloud-based servers.
管理器实例将IPsec信道交通路由到数据中心，并作为基于云计算的服务器之间的加密交换机。
A private network between two remote sites, over a secure encrypted virtual Internet connection (a tunnel).
两个远程站点间专用网络，通过安全加密的虚拟因特网连接通道。
A normal proxy can tunnel encrypted data, but it cannot cache it.
正常可以…加密数据，但不能缓存它。
A normal proxy can tunnel encrypted data, but it cannot cache it.
正常可以…加密数据，但不能缓存它。
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