In Listing 3 you can see the TCP header.

在清单3中，您可以看到TCP报头。

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TCP header, which includes information on the port, implied protocol, flags and sequencing Numbers.

TCP报头，它包含端口上的信息、隐含的协议、标记和顺序编号。

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These are important fields in the TCP header, and the following section on TCP connection setup and shutdown will give you an even better understanding of what they are used for.

以上是 TCP 头中的重要字段，下面关于 TCP 连接的建立和关闭的几节将使您更好地理解这些字段的用途。

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