osi model layers explanation

is transmitted, and the circuit seems to be invisible to the transmitted bit stream. Data Link LayerThe data link layer, the second layer of the OSI model, is responsible for establishing and managing links between nodes. The main function of this layer is: through various control protocols, the error-prone physical channel becomes error-free and can reliably transmit data frame data link.The physical link

designed and developed into a complete, collaborative protocol series (that is, the protocol family), rather than developing each protocol in an isolated way. In the early days of network history, the International Organization for Standardization (ISO) and the International Telegraph Telephone Advisory Committee (CCITT) jointly published a layer-7 Reference Model for Open System Interconnection. Network processes in a computer operating system inclu

layer here?The OSI model is a layered model, that is, it is divided into several parts, each of which is called a layer, each layer plays a fixed role, as seen in:650) this.width=650; "Src=" https://mmbiz.qlogo.cn/mmbiz/ iahl5mqlicpynj6o78bkudfel4pys77dv4niv6aastde8bioyfpm3y7lul0oicsou3pvlbch3s0wd5skocyezj6ca/0 "style=" Height:auto ; "alt=" 0 "/>

1. Definition: OSI (Open System Interconnection), an Open System Interconnection Reference Model, which logically divides the network protocol into seven layers. Each layer has related and corresponding physical devices. For example, a conventional router is a layer-3 switching device and a conventional switch is a layer-2 switching device. The

TCP/IP four layer modelTCP/IP is synonymous with a set of protocols, and it also includes many protocols that make up the TCP/IP protocol cluster. TCP/IP protocol cluster is divided into four layers, IP is located in the second layer of the Protocol cluster (corresponding to the third layer of OSI), TCP is located in the third layer of the Protocol cluster (corresponding to the fourth layer of

Table 1-2. Table 1-2 Functions and protocols of the TCP/IP Model Level name Merit Agreement Network Interface(Host-to-net layer) Responsible for actual data transmission, corresponding to the lower two layers of the OSI reference model HDLC (Advanced Link Control Protocol)PPP (Point-to-

), i.e. the ISO open Interconnect system Reference Model. Such as. Each layer implements its own functions and protocols, and communicates with the interfaces of the neighboring layers. The OSI service definition provides a detailed description of the services provided at each level. A layer of service is the ability of the layer and its lower

ISO open Interconnect system Reference Model. Such as. each layer implements its own functions and protocols, and communicates with the interfaces of the neighboring layers. The OSI service definition provides a detailed description of the services provided at each level. A layer of service is a capability of the layer and its lower

The OSI reference model has many similarities with the TCP/IP reference model. They are based on the concept of an independent protocol stack. In addition, the features of the layer are similar. For example, in the two models, the transmission layer and above all provide end-to-end and network-independent transmission services for processes that want to communica

Basic OSI Layer-7 model knowledge and common applications at each layer (1) OSI Open Source Initiative (OSI) is a non-profit organization designed to promote the development of Open Source software. The full name of the OSI Reference Mo