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

The agreement between CPU and OS (CPU Heart, OS) integrates CPU management and memory management. The importance of protocol consistency in the computer external network equipment management, etc., the protocol packet switching protocol in the computer who defines the chaotic scene at the beginning of the birth of the hierarchical osi reference model of the OSI (open systems interconnection) protocol developed by ISO (international organization for standards) and the osi protocol 7-1 application layer presentation layer transport layer data link layer physical layer application layer (for application programs and Specify the details of the communication in the application. Including file transfer, email, remote login, etc.) presentation layer (converts the information of the application layer to the appropriate network transmission format-utf-8, or converts the data from the next layer to a format that can be processed by the upper layer, responsible for the conversion of the data format) the session layer (responsible for establishing and disconnecting Management of data transmission such as data segmentation) transport layer (guarantee of reliable transmission) network layer (transmission of data to the destination address, mainly responsible for addressing and routing) data link layer (generation and reception of data frames 0,1) physical layer (01 and high and low level conversion) Classification of data transmission connected and connectionless circuit switching and packet switching (circuit switching limitations Packet routing cache and queuing processing delivery (full use of resources) unicast 1-1 broadcast 1 min 1-n/m anycast 1-1 unique address hierarchical network elements communication media (twisted pair cable, fiber optic cable, coaxial cable, serial cable, etc.) (airwaves Microwave) network card concept repeater (physical layer signal amplification) bridge (layer 2 switch) autonomous learning bridge (AB belongs to network A, A sends data to B, bridge judges A data network A, B transmits data to A, W bridge determines that B belongs to network A, next time A data will not be transferred to B, because AB can be transmitted directly) router (layer 3 switch) layer 4-7, various load balancing equipment gateways Data conversion between transport layer and application layer (mobile mailbox and computer mailbox "two mailbox protocols are not the same 'presentation layer'")

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.