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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).At this time, many people think that gender affects the classification ability of babies, but Professors Heron and Slaughter do not think so. They think that the difference in classification ability of babies of different genders is not due to gender, but due to the different knowledge and experience they have acquired. For example, the fact that male babies can classify cars may be that they pay more attention to the color and wheel movement of toy cars and pay less attention to the information of dolls.特七远远瞧着低矮的土城墙：五丈？这是外廓，后来扩建的，除主要城门用砖砌外，多是由山崖砍削或培土夯成，自然不牢，重防都布置到北方去了，也没人觉得南京会有战事。Law of Demeter (LoD) is also called Least Knowledge Principle (LKP), which means that an object should know as little as possible about other objects. In other words, a module or object should interact with other entities as little as possible, making the system functional modules relatively independent, so that when a module is modified, the fewer modules will be affected and the easier it will be to expand.消失了12个年头之后，父亲重新回到家中，而两个儿子——安德列（Vladimir Garin 饰）和伊万（Ivan Dobronravov 饰）已经长大。他们虽时时刻刻思念父亲，然真正相会时却产生了隔膜感。可是，他却举不出有力的证据来，整件事无迹可寻，有破绽的地方也拿不出证据来。