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A06B-0855-B190

網橋 網橋概述： 依據幀地址進行轉發的二層網絡設備，可將數個局域網網段連接在一起 。網橋可連接相同介質的網段也可訪問不同介質的網段。網橋的主要作 用是分割和減少沖突。它的工作原理同交換機類似，也是通過MAC地址 表進行轉發。網橋主要完成三個功能：轉發、過濾數據幀；幀格式轉換 ；傳輸速率轉換。 透明網橋：無需改動設備的軟硬件配置，即可完成LAN互連的網橋。交換 機可看做多端口透明網橋。 路由器的簡單介紹

A06B-0855-B190

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》

A06B-0855-B190

交換機的三個主要功能： ·學習：以太網交換機了解每一端口相連設備的MAC地址，并將地址同 相應的端口映射起來存放在交換機緩存中的MAC地址表中。 ·轉發/過濾：當一個數據幀的目的地址在MAC地址表中有映射時，它被 轉發到連接目的節點的端口而不是所有端口（如該數據幀為廣播/組播幀 則轉發至所有端口）。 ·消除回路：當交換機包括一個冗余回路時，以太網交換機通過生成樹 協議避免回路的產生，同時允許存在后備路徑。

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