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"It can also be said that, but the premise is that there are only big wasps, but there are not only big wasps, so things are not so simple. If it were just big wasps, it would not be like what it was later." Zhang Xiaobo said.What is DDoS?《芝加哥警察局》演绎情报科打击贩毒和侦破案件之余，将主要成员在警局内外所面临的种种向我们娓娓道来，在新一季中继续深入展现这些蓝衣卫士的一线生活。　　莫名其妙地突然到了1964年的东京，The picture shows Mr. Sun and his team members communicating with each other.In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue)./bounce