UNIX网络编程卷1：套接字联网API（第3版）

第2章

传输层：TCP、UDP和SCTP

2.4

TCP

TCP不能被描述成100%可靠的协议

　　数次重传失败，则放弃

　　数据的可靠递送和故障的可靠通知

UDP

不具有可靠性

不提供确认、序列号、RTT估算、超时、重传等机制。

　　数据在网络中被复制、被网络重新排序：UDP应用需要处理这些情况

2.7 TIME_WAIT状态

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