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Computer network. Introduction to OSI layer
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OSI protocol: physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer.

TCP/IP protocol: network interface layer, Internet layer, transport layer and application layer.

The protocols of each layer are as follows:

Physical layer: RJ45, clock, IEEE802.3 (repeater, hub, gateway).

Data link: PPP, FR, HDLC, VLAN, MAC (bridge, switch).

Network layer: IP, ICMP, ARP, RARP, OSPF, IPX, RIP, IGRP, (router).

Transport layer: TCP, UDP, SPX.

Session layer: NFS, SQL, NETBIOS, RPC

Presentation layer: JPEG, MPEG, ASII

Application layer: FTP, DNS, Telnet, SMTP, HTTP, WWW, NFS.

The functions of each layer are as follows:

Physical layer: Transmission of bits through media to determine mechanical and electrical specifications (bit).

Data Link Layer: Assemble bits into frames and perform point-to-point transmission (frame frame).

Network layer: responsible for data packet transmission from source to destination and Internet interconnection (packets).

Transport layer: provides reliable end-to-end messaging and error recovery (segment).

Session layer: establish, manage and terminate sessions (session protocol data unit SPDU)

Presentation layer: translate, encrypt and compress data (representing PPDU).

Application layer: means to allow access to OSI environment (application protocol data unit APDU)