TCP使用的流量控制协议是（ ）。
- A.固定大小的滑动窗口协议
- B.可变大小的滑动窗口协议
- C.后退N帧ARQ协议
- D.停等协议
正确答案及解析
正确答案
解析
TCP是全双工的协议，会话的双方都可以同时接收、发送数据。TCP会话的双方都各自维护一个“发送窗口”和一个“接收窗口”。其中各自的“接收窗口”大小取决于应用、系统、硬件的限制（TCP传输速率不能大于应用的数据处理速率）。各自的“发送窗口”则要求取决于对端通告的“接收窗口”，要求相同。
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