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  3. A transport layer protocol has several r

A transport layer protocol has several r

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问题 A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port  （  ） to accomplish this. Another responsibility of a transport layer protocol is to create a （  ）  and error-control mechanism at the transport level. TCP uses a sliding （  ）  protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve （  ） control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends （  ） of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.A.portsB.streamsC.packetsD.cells
选项 A.ports
B.streams
C.packets
D.cells
答案 B
解析 传输层协议有多种作用。其一是产生进程（或程序）之间的通信，TCP使用端口号来实现这个功能。传输层协议的另一个作用是形成传输层的流量和差错控制机制，TCP使用滑动窗口协议来进行流量控制，并且使用应答分组、超时机制和重传技术来实现差错控制功能。传输层还要为应用程序建立连接，应用程序向传输层发送数据流，发送方的传输层就与接收方的传输层建立对应的连接。
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