In Listing 3 you can see the TCP header.
在清单3中，您可以看到TCP报头。
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。
When a TCP segment is received, the TCP router knows which port to pass it to by looking at the port number in the TCP header.
当接收到一个tcp段时，tcp路由器通过查看tcp报头中的端口号就知道向哪个端口传送包。
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。
The ESP header is located after the IP header and before the transport mode protocol (UDP or TCP) or before an encapsulated IP header when using tunneling.
ESP报头位于IP报头之后，传输模式(UDP或者TCP)之前，或者当使用隧道时是在封装的IP报头之前。
The ESP header is located after the IP header and before the transport mode protocol (UDP or TCP) or before an encapsulated IP header when using tunneling.
ESP报头位于IP报头之后，传输模式(UDP或者TCP)之前，或者当使用隧道时是在封装的IP报头之前。
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