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For example, I invited a sister to a restaurant for dinner, but I didn't know her preferences. In this way, we will take our sister to the hotel and let her order what she likes when ordering. This also realized the factory model, but I don't have to care about what my sister likes to eat, but let her decide what to eat.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).Civil aviation pilots are the main force in the civil aviation industry. The clothes of civil aviation pilots are white shirts in summer and black suits in winter. The colors are basically uniform all over the world, but the styles are formulated by various companies, and each company is not the same. Civil aviation pilots are roughly divided into two grades: the captain and the co-pilot, but the captain and the co-pilot are divided into many grades. The co-pilot is generally divided into the first-stage co-pilot (F1), the second-stage co-pilot (F2), the third-stage co-pilot (F3), the fourth-stage co-pilot (F4) and the left-seat co-pilot (FL). The captain is divided into the captain, the teacher, the inspector, etc.在纳粹德国，玩具制造商拥有一本神秘的书籍，赋予无生命的生命。在躲过希特勒命令取回书的党卫军之后，这位玩具商登上了一列火车企图逃离该国。认为他很清楚，玩具制造商很快就发现，一批高级纳粹军官也加入进来。最终，他的秘密被揭露出来，纳粹关闭。但是，玩具制造商已经使用这个神奇的东西来带来一个名叫罗伯特的复古娃娃来生活 - 而罗伯特将毫无阻碍地保护他的主人。所以，当玩具制造商和杀手娃娃拿起纳粹时，就开始了一场血腥的战斗。这是对死亡的一场战斗，只有胜利者才会在下一站下车。马车尚未停稳，就从车上跳下一个十二三岁的少年，冲着老管家叫道：蔡爷爷。