1990年，ABB公司開始雄心勃勃地將業務范圍擴展到了中歐和東歐地區， 并準備將業務范圍擴展到亞洲地區，而在美國和西歐地區的收購活動逐 漸減慢，轉而從事合并和重組的活動。 1991年，在中歐和東歐地區繼續進行投資，到這一年底，

聯系人：郭先生
聯系電話：18971415643《優先》
座機：027-83238871
傳真：207-61537051
QQ：810334512《優先》

注意： 直通式的轉發速度大大快于存儲轉發模式，但可靠性要差一些，因為可 能轉發沖突 幀或帶CRC錯誤的幀。 生成樹協議 消除回路： 在由交換機構成的交換網絡中通常設計有冗余鏈路和設備。這種設計的 目的是防止一個點的失敗導致整個網絡功能的丟失。雖然冗余設計能夠 消除單點失敗的問題，但也導致了交換回路的產生，它會導致以下問題 。 ·廣播風暴 ·同一幀的多份拷貝 ·不穩定的MAC地址表 因此，在交換網絡中必須有一個機制來阻止回路，而生成樹協議（Spa nning Tree Protocol）的作用正在于此。

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