A socket is basically an end point of a co

问题单项选择题

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 oncomputers attached to the network. A sockettwo addresses:. Sockets provide acommunication channel between one or more systems.
There aresockets separately using TCP and UDP.

A．message and packet

B．packet and frame

C．stream and datagram

D．flow and block

答案

参考答案：C

解析：

[分析]：一个套接字基本上是两个应用程序间通信连接的一个终点。套接字可遍布一个网络，连接两个或多个运行在属于此网络的独立的(separate)计算机上的应用程序。一个套接字由两个地址组成(is composed of)：端口号和IP地址(port number and IP address)。套接字提供了一个介于两个或多个系统间的全双工的(full-duplex)通信通道。
套接字分为流套接字和数据报(stream and datagram)套接字，分别使用TCP和UDP协议。