osi layers

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 as follows: 1. If two computers

LayerThe closest to the user, to provide Internet services to the user application.TCP/IP Model:1.application LayerHandles high-level protocol, presentation, coding, and session control issues, and ensures that the data is properly packaged.2.transport LayerTcp:transmission Control ProtocolUdp:user Datagram ProtocolThe format of the data is segement3.Internet LayerIndependent of path and network, function is path selection and message exchange, IP protocol.4.network Access LayerCare about all t

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

1. Relationship between the OSI seven layer and the TCP/IP four layer 1.1 OSI introduces the concepts of services, interfaces, protocols, and hierarchies, and TCP/IP builds the TCP/IP model using these concepts from OSI. 1.2 OSI first has the model, then has the agreement, first has the standard, then carries on the pr

OSI has 7 layers, application layer, presentation layer, Session Layer, transmission layer, data link layer, and physical layer. The application layer is the only window in which the network can provide application services to end users. Its purpose is to support the requirements of applications connected to users. Due to different user requirements, the application layer contains a variety of application

The correspondence between the OSI model and the TCP/IP protocol the layers of popular TCP/IP protocols are not divided by the OSI reference model, but have a general correspondence with them. Network layer protocols mainly include the IP protocol to encapsulate and send IP packets. Grouping routing and avoiding blocking are the key design issues here. The Transp

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dreamweaver| Tutorials | Getting Started A layer (Layer) is an HTML page element that you can position anywhere on the page. Layers can contain text, images, or other HTML documents. The appearance of the layer makes the Web page extend from two-dimensional plane to three dimensions. You can make elements on the page overlap and complex layouts. First, take a look at the following figure: Let's start with a layer. 1, in the "Window" menu, select "Lay

theoryFirst, I would like to ask a few questions first:(1) In Webgis, is the topographic map itself raster or vector data?(2) When the user needs to interact with the layer, such as the need for the layer to respond to the Click event, return the attribute at the click, when the layer is displayed with the data of the grid, or vector data?(3) It is necessary to determine the topological relationship of two layers, such as determining which houses in

Errors that may occur after you start editing:If ArcMap encounters a problem starting an edit session on the selected data, a dialog box pops up to provide additional information. You may receive an error, warning, or informational message. When an error occurs, the user cannot start any edit sessions. You can edit the data only if the problem is resolved. You receive an error message if there are no editable data sources, licensing issues (for example, if you try to edit certain types

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 facilitate management, hosts are grouped according to certain characteristics. When grouping, refer to three aspects: 1. Geographical Loc

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

Layers in OSI Function TCP/IP protocol family Application Layer File transmission, email, file service, virtual terminal TFTP, HTTP, SNMP, FTP, SMTP, DNS, Rip, Telnet Presentation Layer Data formatting, code conversion, and Data Encryption No agreement Session Layer Release or establish contact with other contacts No agreement Transport Layer Pr