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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.称帝闹剧告败，军阀混战纷争，城头王旗乱换，百姓人心浮动，北京南城海王村街上古玩店鳞次栉比，尚珍阁梁掌柜被人算计，一幅古画上走了眼，呆不下去了，含恨把店交给了徒弟彝贵，弃业回乡嘱咐周彝贵今后切不可因小利而失大义，让徒弟以之为鉴，做事先做人，周彝贵牢记师父教诲，与人为善童叟无欺，尚珍阁日渐红火，清室后裔富嗣隆一心要削爵递禄之后重做人上之人，府中养了一个戏班子，以办堂会之机遍邀权贵，另外投洋人之所好，不断把古玩珍奇送进领事馆，取得了洋人领事信任，海王村街上开古钱店掌柜余旺财个心怀叵测趋利小人，一心想把周彝贵尚珍阁据为己有，竭尽明夺暗毁之能事投靠到富嗣隆门下，为其走卒为了发财挖坟盗墓坏事做尽Red: safflower, madder沿河找了十几里，都没发现他们，说不准就跑进山里了。Reason for Choice: Mini Yang is the only woman among the four options.杨长帆立刻恭恭敬敬道若先生传妙计，我必有重谢。