OSI Network model

Layer function in OSI TCP/IP protocol family

Application layer File transfer, e-mail, file service, virtual terminal tftp,http,snmp,ftp,smtp,dns,telnet presentation layer data formatting, code conversion, data encryption no protocol session layer lifted or established contact with other Contacts no protocolThe transport layer provides an end-to-end interface to the TCP,UDP network layer for packet selection routing IP,ICMP,RIP,OSPF,BGP,IGMP the data link layer transmits address frames and error detection functions Slip,cslip,ppp,arp,rarp, MTU physical layer transmits data on physical media as binary data iso2110,ieee802,ieee802.2 TCP/IP five Layer Model Protocol application layer file transfer, e-mail, file service, virtual terminal TFTP,HTTP,SNMP , the Ftp,smtp,dns,telnet Transport layer provides an end-to-end interface TCP,UDP The network layer chooses the routing for the packet ip,icmp,rip,ospf,bgp,igmp the data Link layer transmits the address frame and the error detection function Ability to slip,cslip,ppp,arp,rarp,mtu the physical layer to transmit data on physical media in the form of binary data iso2110,ieee802,ieee802.2 physical layer: repeaters, hubs, and the twisted pair we usually say also work on the physical layer data link Layer: Bridge (now rarely used), Ethernet switch (second layer switch), network card (actually the NIC is half working on the physical layer, half working on the Data Link layer) network layer: router, three layer switch Transport layer: Four layer switch, also has a router working on layer four

OSI Network model