osi layer protocols and functions

The OSI Reference Model: The ISO/IEC 7498 standard defines a 7-tier architecture model for network interconnection, the Open Systems Interconnect Reference Model.The OSI Reference Model defines the hierarchical structure of open systems, the interrelationships between hierarchies, and the possible services that are included in each layer. The

The basic functions of the OSI network layer the network layer needs to execute four basic tasks: Addressing, encapsulating, unencapsulating, and routing with IP addresses. The first three items are easy to understand. routing is the most complex and technical part. 1. Grouping hosts into networks is very social. To fa

. For example, the email client program and Web browser. Other services need to use network resources through the application layer service, such as file transmission. Different data types correspond to different network services, so that the lower layers of the OSI model can process data correctly. The Protocol defines the standards and data to be put into use. Each application and network service must use

layer help one OSI layer to communicate with the corresponding layer of another computer system. A specific layer of an OSI model is usually associated with the other three OSI layers:

The linux OSI Layer-7 model, TCP/IP protocol stack, and the structure of each layer reveal big secrets. The osi protocol stack When I learn Linux, I know the OSI model even if I am a little cute. What ?! You don't know !!! Okay, this secret is taken away. Thank you ~~~ I,Tw

four protocol tiers of the TCP/IP tiered model perform the following functions, respectively:First layer: Network interface layerIncludes protocols for collaborating on the transfer of IP data over existing network media. In fact, the TCP/IP standard does not define the functions corresponding to the ISO data link

layer, and data link layer of computer B.5. Advantages of OSI layering 1) people can easily discuss and learn the normative details of protocols. (2) The standard interface between layers facilitates modular engineering. (3) creating a better interconnection environment. (4) Reduced Complexity, made the program easier

communication subnets. The task of the network layer is to select the appropriate inter-network routing and switching nodes to ensure the timely transmission of data. The network layer consists of a packet of frames provided by the data link layer, which encapsulates the network layer header, which contains the logica

(Digital Network Architecture) the digital network architecture is the most famous. In order to solve the Interconnection problem between networks of different architectures, ISO (Be careful not to mix with OSI) developed an Open System Interconnection Reference Model (Open System Interconnection Reference Model) in 1981, OSI/RM ). This model divides Network communication into seven layers, which are Physi

layers, with three layers corresponding to the corresponding layers in the ISO Reference Model. The ICP/IP protocol family does not contain the physical layer and data link layer. Therefore, it cannot independently complete the functions of the entire computer network system and must work with many other protocols. Th

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-

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

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 laye