Exchange type technological development process

The computer technology and the communication union promoted the rapiddevelopment which the computer local area network winds, to the 90'sintermediate stages 1000MBPS exchange type Cisco 350-029 ethernet mounts the stagefrom at the end of the 60's ALOHA appearance declares a position,during the short 30 years passed through as simplex from as theduplex, from Cisco 350-029 share to the exchange, from low speed to high speed, fromto are simply complex, from expensively to popular leap.
The local area network exchange technology development must trace totwo ports nets bridge. The bridge is one kind of memory retransmissionunit, uses for to connect the similar local area network. Looked fromthe internet structure that, the bridge is belongs to the DCE levelthe end-to-end connection; Looking from the agreement level that, thebridge is carries on the memory in the logical link level logarithmaccording to the frame to retransmit; With the repeater in first, therouter is similar in the third function. Two ports nets bridge nearlyis and the ethernet simultaneously develops.
The ethernet exchange technology (SWITCH) is develops in the multi-ports net bridge foundation with the beginning of the 90's, realizesthe OSI model next two agreements, has the very complicated relationswith the net bridge, even is called by the field public figure "Many relates in together net bridge " Therefore present exchangetype technology certainly not be new standard, but is the existingtechnical new application, is one kind improved local area networkbridge, compares with the traditional net bridge, it can provide moreports (4 ~ 88), a better performance, the stronger management functionas well as a cheaper price. Now certain local area networkswitchboards also have realized the OSI reference model thirdagreement, realizes the simple routing function, at present the veryhot third exchange refers to this. The ethernet switchboard also issimilar with the telephone switchboard, besides provided the memory toretransmit (STORE ANG FORWORD) the way also to provide other bridgejoint technologies, for example: Goes nonstop to the way (CUTTHROUGH).