以下关于网络控制的叙述，正确的是（ ）。
- A.由于TC.P的窗口大小是固定的，所以防止拥塞的方法只能是超时重发
- B.在前向纠错系统中，当接收端检测到错误后就要请求发送端重发出错分组
- C.P的窗口大小是固定的，所以防止拥塞的方法只能是超时重发B. 在前向纠错系统中，当接收端检测到错误后就要请求发送端重发出错分组C 在滑动窗口协议中，窗口的大小以及确认应答使得可以连续发送多个数据
- D.在数据报系统中，所有连续发送的数据都可以沿着预先建立的虚通路传送
正确答案及解析
正确答案
解析
TCP采用可变大小的滑动窗口协议进行流量控制。在前向纠错系统中，当接收端检测到错误后就根据纠错编码的规律自行纠错；在后向纠错系统中，接收方会请求发送方重发出错分组。IP协议不预先建立虚电路，而是对每个数据报独立地选择路由并一站一站地进行转发，直到送达目标地。
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