一种典型的WAN由称为信息包交换机的电子设备通过通信线路连接而成。
A typical WAN consists of electronic devices called packet switches interconnected by communication lines.
信息包交换的过程相当于一个益智拼图游戏，该游戏中的图案在生产厂家被分解为许多拼合小图并装入胶袋。
Packet switching is similar to a jigsaw puzzle. The image that the puzzle represents is divided into pieces at the manufacturing factory and put into a plastic bag.
在客户端与服务器之间的通信和信息交换，以客户端对数据包进行格式化作为开始(如下所示)，并将其发送给服务器。
The contact and exchange of information between the client and the server begins with the client formatting a packet, as shown below, and sending it to the server.
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