The underlying network architecture can be divided into three layers (Device layer, Transport layer, and Control layer) plus the service layer and will be introduced from bottom to top respectively.

基础网络体系结构可分为三个层次(设备层、传输层和控制层)，其上还有服务层，我们将按照从下向上的顺序分别进行介绍。

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The two most popular transport layer protocols are the transmission control protocol (TCP) and the user datagram protocol (UDP)

两种最流行的传输层协议是传输控制协议（TCP）和用户数据报协议（UDP）

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Stream Control Transmission protocol (SCTP) is a new transport layer protocol added to the 2.6 kernel.

流控制传输协议(SCTP)是2.6内核中增加的一个新的传输层协议。

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