网络通常以层或层的形式组织起来，每个层都建立在它的底层之上。层的名称、

Networks are usually organized in layers or layers, and each layer is built on top of its bottom layer. The name, number, content and function of the layer vary from network to network. But the purpose of each layer is to serve its high-level structure, which is the same. The ontology and network at this layer are collectively referred to as network architecture. As a specific structure, OSI and TCP/IP systems are the most important and widely used network architectures. There are seven layers of OSI, and each layer defines different functions. TCP/IP evolved from the OSI structure.

网络通常以层或层的形式组织起来，每个层都建立在它的底层之上。层的名称、编号、内容和功能因网络而异。但是每一层的目的是为其高层次结构服务，这是一样的。这一层的本体和网络统称为网络体系结构。作为一种特定的结构，OSI、TCP/IP体系是最重要和应用最广泛的网络体系结构。OSI一共七层，每层定义了不同的功能。TCP/IP就是从OSI结构演化而来。

Networks are usually organized in the form of layers or layers, and each layer is built on top of its bottom layer. The name, number, content, and function of the layer vary from network to network. But the purpose of each layer is to serve its high-level structure, which is the same. Ontology and network in this layer are called network architecture. As a specific structure, OSI and TCP / IP are the most important and widely used network architecture. OSI consists of seven layers, each of which defines different functions. TCP / IP is evolved from OSI structure.<br>