What are the 7-layer network structures?

The 7-layer network structure is: Application layer (Application), presentation layer (Presentation), session layer (Session), transport layer (Transport), network layer (Network), data link layer (Data Link) ), physical layer (Physical).

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What are the seven-layer network structures?

7-layer network structure

Layer 7 refers to the OSI seven-layer protocol model, mainly: application layer (Application), presentation layer (Presentation), Session layer (Session), transport layer (Transport), network layer (Network), data link layer (Data Link), physical layer (Physical).

##Presentation layerCSS GIF HTML JSON XML GIFData flowSession layerFTP SSH TLS HTTP(S) SQLData flowTransport layerTCP UDPData segmentTransport layerNetwork layerIP(IPV4, IPV6) ICMPData packetInternet layerData link Road layer802.2, 802.3ATM, HDLC, FrameNetwork interface layerPhysical layerV.35, EIA/TIA-232Bitstream

OSI Model	Main Protocol	Unit	TCP/IP
Application layer	Telnet, FTP, HTTP, SNMP, etc.	Data flow	Application layer

##Structure name##Application layerDetermine the communication object and provide an interface to access network servicesGatewayPresentation layerResponsible for data encoding and transformation (interface and binary data conversion, high-level language and machine language conversion) data compression, decompression, encryption, and decryption. It is processed into different formats according to different application purposes, which is reflected in the various file extensions we see. GatewaySession layerResponsible for establishing, maintaining, and controlling sessions Simplex, Half duplex, and Full duplex Service of three communication modes (Full duplex)GatewayTransport layeris responsible for dividing and combining data to realize end-to-end logical connection Three-way handshake, connection-oriented (Connection-Oriented) or non-connection-oriented (Connectionless-Oriented) services, flow control (Flow control), etc. all occur at this layer. It is the first end-to-end, that is, the host-to-host level. GatewayNetwork layerResponsible for managing network addresses, locating devices, and determining routingRouter, bridge routerData link layerResponsible for preparing physical transmission, CRC check, error notification, network topology, flow control, etc.Switches, network bridges, network cards Physical layer is a real physical link, responsible for sending and receiving data in the form of bit streamhub, relay Transmitter, cable, transmitter, receiverFor more related articles, please visit PHP Chinese website

Function	Main equipment

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