6DD1681-0CA2

交换式结构： 在交换式以太网中，交换机根据收到的数据帧中的MAC地址决定数据帧 应发向交换机的哪个端口。因为端口间的帧传输彼此屏蔽，因此节点就 不担心自己发送的帧在通过交换机时是否会与其他节点发送的帧产生冲 突。 为什么要用交换式网络替代共享式网络： ·减少冲突：交换机将冲突隔绝在每一个端口（每个端口都是一个冲突 域），避免了冲突的扩散。 ·提升带宽：接入交换机的每个节点都可以使用全部的带宽，而不是各 个节点共享带宽。

6DD1681-0CA2

联系人：郭先生
联系电话：18971415643《优先》
座机：027-83238871
传真：207-61537051
QQ：810334512《优先》

6DD1681-0CA2

1800年前的汉代，大科学家张衡不仅发明了地动仪，而且发明了计里鼓 车。计里鼓车每行一里，车上木人击 木马车 鼓一下，每行十里击钟一下。 后汉三国时期，蜀国丞相诸葛亮成功地创造出了“木牛流马”，并用其 运送军粮，支援前方战争。 1662年，日本的竹田近江利用钟表技术发明了自动机器玩偶，并在大阪 的道顿堀演出。 1738年，法国天才技师杰克·戴·瓦克逊发明了一只机器鸭，它会嘎嘎 叫，会游泳和喝水，还会进食和排泄。瓦克逊的本意是想把生物的功能 加以机械化而进行医学上的分析。

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