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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.At present, the progress of farmers in the society is the progress of the countryside. Improving the quality of farmers is the fundamental plan to realize the economic development, social progress and long-term stability in the countryside. Therefore, the work of popularizing education for all must be carried out attentively. The improvement and progress of the quality of the whole peasant team mainly depends on the progress and improvement of the young people. They are creative and full of vitality. They are representatives of the new rural productive forces and contain huge human resources. Stabilizing and strengthening agriculture and improving its comprehensive production potential require them to cultivate. To increase farmers' income and lead a rich and polite life, they need to explore. To strengthen the construction of democracy and legal system and spiritual courtesy at the grass-roots level in rural areas and to maintain rural stability, they need to play an attentive role. Therefore, the quality of the vast number of rural youth and whether their intentions and creativity can be brought into play are directly related to the smooth realization of the cross-century development goals of China's agriculture and rural areas.3. A dialog box pops up.4. Os.remove ()--Deletes the specified file我们上次见到拉夫特一家已经六年了。戴夫和朱莉带着最小的女儿鲁比在乡下开创了新的生活，而年长的孩子们面临着新的挑战，爷爷泰德也在努力寻找自己的位置。由于戴夫享受着新获得的自由，朱莉必须协调好自己对家庭的责任。