A socket is basically an end point of a communication link between two applications. Sockets that extend over a network connect 

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问题 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(61)computers attached to the network. A socket(62)two addresses:(63). Sockets provide a(64)communication channel between one or more systems.There are(65)sockets separately using TCP and UDP.

选项 A、E-mail address and IP address
B、MAC address and port address
C、MAC address and IP address
D、port number and IP address

答案D

解析
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