IP communications involves the transmission of information in packets on an as-needed basis.The route a packet of information follows can and does change throughout the transaction,unlike the fixed path of a circuit.
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- IP通信发展到按需求以包的形式进行信息传输,与电路(交换)中固定通道不一样,在一次交易中信息包经过的路由是可以并一定是改变的。