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).
OSI Model |
Main Protocol |
Unit |
TCP/IP |
Application layer |
Telnet, FTP, HTTP, SNMP, etc. |
Data flow |
Application layer |
##Presentation layer | CSS GIF HTML JSON XML GIF | Data flow |
Session layer | FTP SSH TLS HTTP(S) SQL | Data flow |
Transport layer | TCP UDP | Data segment | Transport layer |
Network layer | IP(IPV4, IPV6) ICMP | Data packet | Internet layer |
Data link Road layer | 802.2, 802.3ATM, HDLC, | Frame | Network interface layer |
Physical layer | V.35, EIA/TIA-232 | Bitstream |
##Structure name
Function |
Main equipment |
| ##Application layer
Determine the communication object and provide an interface to access network services | Gateway |
| Presentation layer
Responsible 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. | Gateway |
| Session layer
Responsible for establishing, maintaining, and controlling sessions Simplex, Half duplex, and Full duplex Service of three communication modes (Full duplex) | Gateway |
| Transport layer
is 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. | Gateway |
| Network layer
Responsible for managing network addresses, locating devices, and determining routing | Router, bridge router |
| Data link layer
Responsible 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 stream | hub, relay Transmitter, cable, transmitter, receiver |
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