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This is very understandable. The purpose of the command mode is to decouple the sender and executor of the command and separate the request from the execution. Students familiar with Struts should know that Struts is actually a technology that separates the request from the presentation, which inevitably involves the idea of the command mode!A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.[Behind More than 2,000 Advertising Violations of Hongmao Medicated Liquor: What Are the Loopholes in Supervision? "没有外人在，尹旭的话说的很直白，傀儡太子并不听话，并不合格。夫のもとから逃れ、息子を連れて家を出た主人公。住む場所も職も見つからず途方に暮れるなか、手助けしてくれたのは先輩シングルマザーたちだった。社会のさまざまなハードルを乗り越えながら、母も子も成長して行く。やがて「児童扶養手当」の削減という大きなハードルが立ち塞がる。そのとき、シングルマザーたちは国会の前に立っていた没想到自己一片热情并未换得好报，事与愿违地落得进退维谷的境地。