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Compared with SYN cache method, SYN? Cookies technology does not need to allocate space at all when receiving a SYN. Because the most basic data that make up the connection state are encoded and compressed into the sequence number bits of SYN-ACK. For a legitimate connection, the server will receive an ACK message segment with a serial number (actually the serial number has been added by 1), then the basic TCB data will be regenerated, and a complete TCB will confirm that the data will be safely instantiated through decompression. This decompression can be successful even under severe attacks, because there is no storage load at all on the host side, only the load that calculates the encoded data into the ACK sequence number. The disadvantage is that not all TCB data can be added to the 32-bit sequence number segment, so some TCP options required for high performance cannot be encoded. Another problem is that such SYN-ACK message segments will not be forwarded (because forwarding requires complete state data).The observer pattern defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time.唐末乱世，朱温残暴杀害唐昭宗李晔，血洗皇城，篡权夺位，灭唐称帝。随着大唐李氏一族共同消失的，还有官府神秘组织“不良人”，以及国库宝藏。江湖盛传，宝藏的秘密藏在龙泉剑中，得剑者得天下。但是，也惟有李氏龙脉，才能洞悉龙泉剑中关于宝藏的秘密。幸运逃过劫难的十皇子李星云，和青梅竹马的师妹陆林轩一直随师父阳叔子隐居，虽但如此，也无法扭转宿命。随着李星云师兄妹开始闯荡江湖，龙泉剑也已悄然现世。江湖三大势力玄冥教、幻音坊、通文馆早已各显神通，明争暗夺。一路江湖历练，李星云师兄妹和同样有着不明身世的通文馆少主张子凡结下不解之缘，再加上幻音坊侍女姬如雪，四个青春少年同群雄侠隐仗剑高歌，裹挟进历史漩涡。Arawee（Jui饰） 和 Anthiga（Rita饰） 是同父异母的两姐妹，她们总是不断的竞争，互不相让，她们拿两兄弟的真爱来当赌注，Arawee 将利用这次机会来报复她的妹妹，因为她不相信真爱，Anthiga 则想方设法想...#Arawee（Jui饰） 和 Anthiga（Rita饰） 是同父异母的两姐妹，她们总是不断的竞争，互不相让，她们拿两兄弟的真爱来当赌注，Arawee 将利用这次机会来报复她的妹妹，因为她不相信真爱，Anthiga 则想方设法想要赢得她爱的男人的心，然而这场比赛却渐渐不受她们控制了...Enterprises must strive to predict the possible security threats to applications and network services and mitigate the consequences of these attacks by formulating security contingency plans.大都会繁华璀璨，可是一班寄居在社会低层的弱势群体，不单止享受不到繁荣带来的富足和温饱，反而遭到压榨和剥削，幸而，在浊世之中，仍有人挺身而出，为这群可怜人仗义执言，他就是盲侠大律师。By the way, how do you know what the PS4 update has updated?