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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).傅吉祥，人称傅老大，因父母早逝，他长子为父，带大了三个弟弟一个妹妹，把他们都送进北京的大学。当弟妹们长大成人、事业有成后，他自己却错过了人生的辉煌时期：因没有生育能力而婚姻失败，失业下岗后成为一名足疗师。但他却用乐观精神去面对一切，仍怀有自己的事业和生活理想，成为一名按摩师和父亲。几个自以为生活幸福、事业成功的弟弟妹妹要帮大哥换一个活法，极力安排他来到北京寻找幸福。然而，生活方式和价值观的不同让老大在陌生的大都市里四处碰壁。在目睹了房地产大亨二弟、官迷三弟、房奴四弟、股疯小五的生活后，老大身心俱疲、倍感茫然。但另一方面，老大又能主宰自己的生活和命运，他一直照顾着孤苦无依的梅好和她的儿子乐乐，像一座大山一样成为弱者最坚实的依靠，展现了独特的人格魅力，并最终令众人感悟到什么才是触手可及的幸福生活。But the others didn't see her. They thought she was as beautiful as she seemed.　　阿伦和雨婕两人的感情渐渐萌芽之际，阿伦的乐团却因为唱片公司的决策使得团员间闹不愉快，雨婕想帮忙分担阿伦的压力与烦恼，却又无力可施，反而造成两人间的不快。阿伦又在此时遇到现已成为摇滚天后的Sharon，两人再次见面，回忆点滴浮现，两人情愫再度悄然而生……揭秘泰国基友名媛们的日常！突袭朋友公寓，发现两个韩国帅哥在床，他们到底在干嘛呢？　　来到这里的死者各种各样，有的已经接受了自己的“死亡”，而有的还没能理解现状。Here we seem to simulate the process of a collection class, does it feel great? In fact, each class in JDK is also these basic things, plus some design patterns and some optimization. As long as we learn and master these things, we can also write our own collection classes and even frameworks!