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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 operating system of Window10 was reinstalled during the vacation. Now reconfigure Java's development environment.这里是“Dunder Mifflin”纸业公司一家小小分公司的办公室，在头脑非常脱线的区域经理迈克尔（史蒂夫·卡瑞尔 Steve Carell 饰）领导下，一群办公室职员的生活每天充满古怪趣味。吉姆（约翰·卡拉辛斯基 John Krasinski 饰）是个诙谐、脑子灵活的恶作剧狂人，整天想出不同点子折腾坐对面的学究型同事杜维特（雷恩·威尔森 Rainn Wilson 饰），后者每每气恼不已，也在工作上暗自对吉姆使坏，还视他做升职最大竞争对手；吉姆的恶作剧搭档是前台女孩潘（珍娜·费舍 Jenna Fischer 饰），两人制造出无止境的欢笑，但潘已经有了未婚夫，吉姆对她动心也只能发乎情止乎礼。办公司里还有脾气古怪的大龄剩女安吉拉（Angela Kinsey 饰）、深受迈克尔歧视的同性恋会计奥斯卡（Oscar Nuñez 饰）、拼命想融入大家都实习生瑞恩（B.J. Novak 饰），无论大家性格合拍与否，彼此的共识都是，经理迈克尔是整间屋最大的极品……本剧是英国BBC情景喜剧《办公室》的美国版。四名聪明的学生成立自己的侦探所，把冒险发布到播客上，成为彼此的可靠好友。他相信，这样练习哪怕几个月，其进益也不容小觑。After the INPUT chain is emptied, there are no rules for the INPUT chain in the filter table, but it can be seen that the default policy of the INPUT chain is ACCEPT, that is, the INPUT chain "releases" all messages sent to the local machine by default, accepts all messages when there are no rules, and releases messages by default when the messages are not matched by any rules.