计算机等级四级网络工程师 笔记第五章交换机网桥中继器综合布线（Computer grade four, network engineer notes, fifth chapter switch, bridge, repeater, integrated wiring）.docVIP

计算机等级四级网络工程师 笔记第五章交换机网桥中继器综合布线（Computer grade four, network engineer notes, fifth chapter switch, bridge, repeater, integrated wiring） The LAN reference model corresponds to the physical layer and data link layer of the OSI model, which divides the DLC into LLC and MAC. Switched LAN is relative to shared LAN, and its core component is the switch. The switch adopts two kinds of forwarding technology (Shortcut switching mode and storage and forward switching mode) [VLAN] Based on virtual LAN switching technology, LAN of the node according to the logic is divided into several working groups, each group is a virtual network between multiple logical workstations to exchange data through Internet [bridge or router], can use [switch port, MAC the network layer address, IP address, broadcast group] definition of virtual LAN [integrated wiring] is a modular, highly flexible information transmission channel between buildings or buildings. Integrated wiring consists of components of different series and specifications, including transmission medium, related hardware, electrical protection equipment, etc.. Compared with the traditional wiring, its advantages are: compatibility, openness, flexibility, reliability, advanced and economical [composition of generic cabling system] The work area subsystem: I. determine the number and types of information: information is divided into socket socket embedded installation socket (dark, twisted pair), surface mounted socket (Ming seat), multi media information socket (fiber and copper), usually choosing the area for the use of 0.75 of the actual area of the II. adapter The wiring (horizontal) subsystem: cable length should be within 90m [wire type is determined according to the transmission rate (below 10M -4 or 5 UTP, 10M to 100M-5 or 6 class 100M, class -6 or above fiber) [] to determine the length of wire socket: information farthest from the connection between the the distance from the nearest Lmax, connection information socket dista