计算机网络-第3章 TCP的流量控制与连接管理-同步电大进度

我会带着你远行 2023-01-15 03:58 101阅读 0赞

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**TCP的连接建立需要\_\_\_\_\_\_\_次握手，连接关闭需要\_\_\_\_\_\_\_次握手。**

*  **A.3，4**
 *  B.4， 3
 *  C.3， 3
 *  D.4， 4

### TCP的连接管理 ###

**TCP连接关闭时，为什么要两方各发送一个FIN?**

为了释放一个连接，任何一方都可以发送一个设置了FIN标志位的TCP段，这表示它已经没有数据要发送了。当FIN段被另一方确认后，这个方向上的连接就被关闭，不再发送任何数据。然而，另一方向上或许还继续着无限的数据流。故关闭另一方的tcp连接，还需被动关闭方发送一个fin。

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