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The second: singleTopCompared 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).《逆光青春》描述六个背景不同,个性迥异的年轻人,在追寻梦想的旅途中相遇相知发生的故事。看角色在逆光中朝梦想前进的执著与彷徨,与他们一同在现实社会中感受温情,体验百态,经历欢喜,也可能遇到悲伤与挫折的其中滋味,继而让人沉淀,萌生希望,涌起再次出发的动力。面对毕业与离别前夕的淡淡哀愁,五人大声宣告自己的梦想,并相约在预言家预测世界末日来临的那一天见面。想阻止，却已经来不及了，就觉眼前人影一闪，啪啪两声脆响传来，人群跟着一静。　　Season 4, Episode 6: The Bruce-Partington Plans《布鲁斯帕廷顿计划》27 April 1988