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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).菊花，小石头死了你都能救活，快救你爹。11. From the "DNS Preference" window opened, click the "Start DNS Preference" button directly. At this time, the program will automatically detect the network delay of each DNS and give the best DNS scheme. Click the "Enable Now" button.毕业于同一所大学、同一班级的好友张桦林、林强、舒凡、苗飞在京城开始了他们的记者生涯。张桦林的女友何琪不愿与桦林分开，不顾父母的反对，辞掉工作，只身来到北京与桦林厮守。感动之余桦林却为如何安置何琪犯了难。在舒凡等人的帮助下。桦林租下一间小屋与何琪结了婚。不久，何琪怀了孕。桦林为了生计，决意要和苗飞去“走穴”。何琪不同意，俩人第一次发生了争执。桦林和林强被报社派去赴灾区采访。他俩联手揭露了一个截留扶贫款、假冒先进的典型。桦林因此被殴伤。祸不单行的桦林，不慎煤气中毒。命是保住了，可何琪却失去了孩子。深受刺激的桦林在一连串的打击下开始消沉，并做出了令何琪意外的举动，辞掉了报社的工作，下海做起了生意。舒凡在电视台创办的“新闻调查”栏目成了台里的名牌节目，受到了观众的欢迎。这日，他接到了外地一厂家的投诉，告北京一家公司有欺诈行为。舒凡决定亲自去调查。深知此事与桦林有牵连的何琪，想劝阻舒凡并告之真相。可舒凡却不辞而别，当夜便登上了西去的列车。无奈之中，何琪只得硬着头皮去找已与她分居的桦林。桦林对此并不凛冽的北风吹过，格外的寒冷，阵阵寒意从领口袖口钻进来时，让人忍不住有些瑟瑟发抖。