In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the an

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问题 In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
A socket is basically an end point of a communication link between two applications. Sockets that extend over a network connect two or more applications running on(66)computers attached to the network. A socket(67)two addresses:(68). Sockets provide a(69)communication channel between one or more systems.
   There are(70)sockets separately using TCP and UDP.

选项 A、message and packet
B、packet and frame
C、stream and datagram
D、flow and block

答案C

解析 翻译如下。
   Socket是两个应用之间的联系接口。Socket使网络中不同的计算机之间的应用能够联系在一起。一个Socket有两个地址:端口号和IP地址。Socket提供了在多个系统中全双工通信的方式。TCP在Socket传递的是字符流,而UDP传递的是数据报。
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