计算机网络是由计算机之间通过电缆、光缆、双绞线或卫星微波等连接介质互联起来而构成的，为了使网络中的不同设备能进行下沉的数据通信则需要预先制定一整套通信双方相互了解和共同遵守的格式和约定，这就是网络协议。互联网正是这样一种按照网络协议进行数据通信从而实现资 The computer network is formed by the interconnection between computers through the connection media such as cables, optical cables, twisted pair or satellite microwaves. In order to enable different devices in the network to sink data communications, it is necessary to make a set of communication parties in advance Understand and jointly abide by the format and convention, this is the network protocol. The Internet is exactly such a network protocol in order to achieve data communications