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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.Third: Distinguish the responsibilities of the class. What this class does must be implemented in this class, and what my class should not do must be implemented by other classes.杨长帆揉着眼睛非常无辜。某日，一个神秘的女人（杰米·亚历山大 Jaimie Alexander 饰）以全裸的姿态出现在了人头攒动的时代广场，她的身上有着造型诡异如同地图一般的纹身，而这个女人对自己的过去和遭遇一无所知。本剧讲述了30多岁的两位主角，通过一款美食家交友APP认识后，一同踏上了美食之旅。两人一边享受着西班牙干腌火腿、日本拉面和世界各地的美食，一边了解着彼此。对日本香橙的共同喜爱，对美食家装模作样的厌恶，让两人心灵相通，但两人过往感情留下的伤疤所激发的不安感和摇摆不定，可能会阻止他们品尝到真爱的味道。马帮四兄弟老大秦天樵下山，遇见了被政府军追捕的神秘女子星谕，一见钟情，并为其解围娶其为妻，秦家的三个弟弟耕、渔、牧虽已成年，却难脱幼气，举止粗野。星谕自觉有义务教育诸弟，担起长嫂为母之责，由此引出一段段欢喜佳话Investment is like a cycle of farming on the most familiar land, while travel is looking for different scenery and experiencing different lives everywhere. What a wonderful life it would be to use the money earned from investment under the principle of constant conservatism to continuously realize novel journeys? But how sad would it be to do the opposite: always use all kinds of novel tricks to try your luck in the stock market to find pleasure, but eventually you didn't make any money and were tied to the computer?