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The LAN(Local Area Network) failures can be divided into common and rare faults.For common breakdowns,the detection procedures usually include such techniques as object check,sectionalized check,and one-by-one eliminating.The rare faults are usually complex and irregular.To deal with the rare faults,it is usually necesarry to combine various techniques together to identify fault sources,such as theoretical analysis,empirical judgement,screen suggestions,etc.