〇.Introduction
In today's digital age, computer networks are like vast rivers and lakes, covering five major schools: physical layer, data link layer, network layer, transport layer and application layer. Each sect has unique skills, and together they build the framework of the modern network. The physical layer is like the cornerstone of the rivers and lakes, transmitting bit streams; the data link layer is like the inheritance of martial arts, organizing the transmission of data frames; the network layer is like a navigation master, looking for transmission paths; the transport layer controls traffic and maintains balance; Various tasks. These five sects have jointly created a borderless digital world, unimpeded information exchange, and highlighted the significance of the Internet. This article will introduce the functions and principles of the five sects (five levels) in a Jianghu tone.
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