osi model pdu

The OSI seven-layer model enables reliable communication between different systems and different networks through seven hierarchical structural models. Therefore, its most basic function is to help different types of host implementation of data transmission.The node that is finished with the relay function is often referred to as a trunk system. In the OSI seven

OSI 7-layer models corresponding to each layer of the OSI model OSI reference model data encapsulation process OSI reference model VS TCP/IP Reference

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The OSI seven-layer model enables reliable communication between different networks of different systems through seven hierarchical structural models, so its main function is to help different types of hosts achieve data transfer.The nodes that complete the relay function are often referred to as trunking systems. In the OSI seven layer

The OSI Layer-7 model enables reliable communication between different networks of different systems through seven hierarchical structural models. Therefore, its most basic function is to help different types of hosts transmit data. The node that completes the relay function is usually called a relay system. In the OSI Layer-7

OSI (open System Interconnection), open Systems Interconnect Reference Model. From bottom to top seven-tier model features and their representative protocols: Physical Layer (physical) : Specifies the mechanical, electrical, functional, and process characteristics that activate, maintain, and close communication endpoints. This layer provides a physical mediu

1.1Network layering This course mainly introduces two different layers:OSILayered Model andCiscoLayer-3 model.Advantages of layering:1. Divide complex networks into layers that are easier to manage.2. When a layer is changed, other layers are not affected, which makes the applicationProgramDevelopers can perform specific design and development.3. In today's network environment, no manufacturer can provide a complete set of solutions and all devices

/wKiom1YltaTRh9BrAAEycQZGSYE235.jpg "title=" QQ picture 20151020113143.png "alt=" Wkiom1yltatrh9braaeycqzgsye235.jpg "/>ICMP protocolLevel of understanding: according to the package classification: if understood as encapsulated on the IP layer 4Classification by service object: Three Layer service is three layer ICMP for IP service so three tierICMP Check network is unblocked, divided into two categories: 1 difference message, 2 information class messageFor example, ping belongs to information c

(single-choice) repeaters, Ethernet switches, routers work at which level of the OSI model: (4 points) A. Physical layer, link layer, network layer B. Physical layer, network layer, link layer C. Physical layer, link layer, Transport layer D. Link layer, link layer, network layer Analytical: Physical layer: Converts data into electronic signals that can be transmitted through physical media equivalent

In the Iso/osi reference Model, the main function of the network layer is () the correct answer: a your answer: a(correct)Route selection, congestion control and network interconnectionProvides a reliable end-one service that transparently transmits messagesData format transformation, data encryption and decryption, data compression and recovery Add notes Collection Error correcting

ISO/OSI network models have been porting Android video codec recently. I haven't written a blog for a long time. I want to write something about the network. I first introduced the ISO network model to my shoes. First, I will draw a picture for your understanding. Www.2cto.comBased on the reference model diagram above, I will explain each layer of the ISO/

OSI reference model and troubleshooting The bottom layer of the OSI reference model provides services for its upper layer. Therefore, troubleshooting should also be performed from the bottom layer to the upper layer. If you are an IT support staff member of a company and an employee calls to say that the webpage cann

This section summarizes the overall framework of network communication and its underlying process. We have learned about the creation and application of sockets, in fact, we are only using sockets this tool, the underlying details of which we are shielded. To complete the data transmission through the Internet, in fact, not only software can be solved, but also need to build hardware systems. Therefore, in order to solve this problem, many experts gathered together, these people are har

In the OSI Reference Model, from bottom to top, each layer accomplishes different, targeted functions. 1. Physical layer (physical layers)The physical layer specifies the mechanical, electrical, functional, and process characteristics that activate, maintain, and close communication endpoints. This layer provides a physical medium for the upper level protocol to transmit data. in this layer, the unit of dat

1. Model Physical Layer: converts data into electronic signals that can be transmitted through physical media equivalent to a porter in the post office. The passes the media transfer bits, providing the mechanical and electrical specifications. The mainly defines the physical device standards, such as the interface type of the network cable, the interface type of the fiber, the transmission rate of various transmission media, etc. Its main role is

OSI Virtual Machine Model "Virtual" means that although an object or device does not exist at a certain time, people can see it. The word "Virtual Machine" is easy for many people to think about. Pop Media and News Broadcasts often use the word "virtual" when reporting new developments in computer simulation and computer games. In any situation, the use of "virtual" means that although an o

Application layer: HTTP Application layerPresentation layer: Coding presentation LayerSession Layer: Port Session LayerTransport Layer: TCP/UDP Protocol Transport LayerNetwork layer: IP tag +--Network layer--+ Network layerData Link layer: Computer MAC address Tag |　　　| Data Link LayerPhysical layer: Network cable, Crystal Head, computer socket | +----> Physical layer+------------------------------------->+"The bottom layer serves the upper layer and is transparent, and the corresponding protoco

Osi:open System interconnection Open Systems interconnectBirth date: The 1970sDevelopment Organization: ISO (International Organization for Standardization)Historical reasons for the OSI Reference Model:International hope that different manufacturers of products can communicate with each other.Features: LayeringDefinition of a layer: a logical grouping of functionally similar functions during communicationTiering Benefits1. Reduce the difficulty and c

Everyone who has studied computer networks must know the OSI seven layer protocol model. The OSI layer Seven protocol model (or OSI seven layer model) is a well-defined protocol specification and is considered a standard reference

IntroductionOSI (open System interconnect), which is open systems interconnection. Commonly called the OSI Reference Model, is the network interconnection model that the ISO (International Organization for Standardization) organization studied in 1985, which gives you an introduction to the OSI Reference