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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.MDT meeting to set up attendance register, and set up a sign-in system, members need to sign the time to attend and leave;How to learn efficiently? I think we need good methods, insist on deliberate practice, ensure sufficient intensity, and effective coaches to provide feedback for learning. This "Deliberate Practice" provides you with effective guidelines.2021年4月7日（星期三）开始！？每周星期三9:00播出？井之原快彦主演！超人气推理小说？《特搜9 season4》期待的开始！？在特搜班前面有一堵巨大的墙…！？？然后……个性派刑警的关系有了新的进展！？？这个春天，特搜班全力奔跑！BIM's information model can be used by managers to query, modify and call, synchronously update system information, and better maintain equipment and buildings. The operation and maintenance of buildings usually include monitoring, communication, ventilation, lighting, elevators and other systems. If the above equipment and pipelines fail, they may affect the normal operation of buildings and even cause safety accidents.In the era of homogenization of products, brand personality is increasingly showing its important position in communication and marketing. Spokesmen should conform to brand personality, and their image and characteristics must match the enterprise products or target consumer groups they represent.The International Basketball Association (FIBA) has a 40-minute match, divided into the first half and the second half, each with 20 minutes.