●Communication protocols are(1)connection—oriented or connectionless，(2)whether the sender ofa message needs to contact and maintain a dialog with the recipient or(3)senda message without any prior connect and with the hope that the recipientreceives everything(4)．These methods(5)the two waysthat communication is implemented on networks．
　　(1)A．not
　　B．neither
　　C．either
　　D．all
　　(2)A．fulled
　　B．flooded
　　C．dapending on
　　D．defined by
　　(3)A．immediately
　　B．simply
　　C．accordingly
　　D．properly
　　(4)A．inorder
　　B．in array
　　C．in series
　　D．in queueing
　　(5)A．make known
　　B．disclose
　　C．reveal
　　D．discover
　　答案：(1)C(2)C(3)B (4)A(5)C
　　解析：通信协议或者是面向连接的或者是面向无连接的。这要看消息的发送者是否需要事先于接收者建立起对话，或者仅仅简单是接收者希望按一定的顺序接收。这两种方式正说明了网路中实现通信的两种手段。

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