Communication protocols are(66)connection-oriented or connectionless,(67)whether the sender of a message needs to contact and ma

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问题 Communication protocols are(66)connection-oriented or connectionless,(67)whether the sender of a message needs to contact and maintain a dialog with the recipient or(68)send a message without any, prior connect and with the hope that the recipient receives everything.(69).These methods(70)the two ways that communication is implemented on networks.

选项 A、not
B、neither
C、either
D、all

答案C

解析
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