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2025-04-04 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
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Shulou(Shulou.com)06/01 Report--
1. OSI
The International Standards Organization (ISO) issued the Open Systems Interconnection reference Model (OSI) in 1984.
Second, the meaning of OSI seven-layer model.
Application layer: an excuse for the Network to serve the end user
Presentation layer: data representation, security, compression
Session layer: establish, manage, and terminate sessions such as breakpoint continuation
Transport layer: define the protocol port number for transmitting data, as well as flow control and error checking to realize the interconnection of programs.
Network layer: logical address addressing, path selection between different networks, and IP address is defined as the best path for data transmission.
Data link layer: establish logical connection, perform hardware address addressing, error checking and other functions, realize communication and frame transmission through MAC address
Physical layer: establish, maintain, disconnect physical connections, define interfaces and media, and realize the transmission of bitstreams
III. Composition of the TCP/IP protocol family
Common protocols:
Application layer: FTP HTTP TFTP SMTP SNMP DNS TELNET POP3 HTTPS
Transport layer: TCP UDP
Network layer: ICMP IGMP IP ARP RARP
IV. The process of data transmission
The process of data encapsulation and unencapsulation
5. PDU (Protocol data Unit)
Transport layer segment segment
Network layer packet packet
Data Link layer frame Fram
Physical layer bit bit
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