Shulou(Shulou.com)06/01 Report--

ISO five layers: application layer, transport layer, network layer, data link layer, physical layer

Application layer: HTTP,FTP,TFTP,SMIP,SNMP,DNS and other (data) computers

Transport layer: tcp Transmission Control Protocol, udp user data Protocol (Transport Protocol, Port) Segment (segment) Firewall

Network layer: icmp,igmp,IP,ARP,rarp (Network Protocol) IP packet (packet) Router

Data link layer: protocol Mac data frame (frame) switch defined by the underlying network

Physical layer: bitstream (bits) network card

The seventh layer divides the application layer into application layer, presentation layer and session layer.

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