数据包封装传输层及其以下的机制由内核提供，应用层由用户进程提供（后面将介绍如何使用socket API编写应用程序），应用程序对通讯数据的含义进行解释，而传输层及其以下处理通讯的细节，将数据从一台计算机通过一定的路径发送到另一台计算机。应用层数据通过协议栈发到网络上时，每层协议都要加上一个数据首部（header），称为封装（Encapsulation），如下图所示：不同的协议层对数据包有不同的称....

文章 2017-10-17 来自：开发者社区

网络基础 : 以太网数据封装

以太网的数据链路层在数据链路层，以太网负责以太网编址，这通常称为硬件编址或 MAC 编址。以太网还负责把来自网络层的分组封装成帧。以太网编址以太网编址使用固化在每个以太网网卡(NIC)中的 MAC (Media Access Control，介质访问控制)地址。MAC (硬件)地址长 48 位，采用十六进制格式。 OUI(Organizationally Unique Identifie.....

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