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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.说实话，小王十分怀疑白大人对张家有企图。……（ps：谢谢你们一直都在，谢谢陪伴这本书成长的每一个人。The 23 design modes, in fact, the predecessors have summed up the ways to solve the problem. Their aim is to ensure the low coupling and high cohesion of the system. The principles guiding them are nothing more than the design principles of packaging change, single responsibility, interface-oriented programming, etc. After that, I will continue to share my WCF learning process. Although there are many WCF series in the blog park, I felt that it was not necessary to write them before, and I felt that I could use them. However, I did not write them. I always felt that the knowledge was not my own and I did not feel in-depth. Therefore, I still want to write such a series. I hope all bloggers will support me more.　　via天涯小筑：警探Grace的儿子不幸惨死在犯罪头目Jimmy Laszlo领导的黑帮家族手中。虽然Jimmy Laszlo没有亲自动手，但他对此事难辞其咎。更糟的是，Grace自己的行为可能与她儿子的死有关。警方不打算追查此事，但Grace决不放弃。她决定私自行动，以卧底身份混入Jimmy Laszlo的团伙，秘密对其成员展开调查。Grace和Jimmy开始寻找团伙内部的叛徒——巧合的是，这个叛徒很可能就是杀害Grace的儿子的元凶。在此过程中，Grace不由自主地爱上Jimmy，她该作何选择Jimmy又该作何选择十年前,大崩塌对世界造成了严重破坏,并导致了神秘的混血儿的出现——出生时半人半兽的婴儿。由于不确定杂交种是病毒的起因还是结果,许多人害怕并猎杀它们。一个名叫格斯（克里斯蒂安·康弗里饰）的鹿角男孩在与世隔绝的森林安居了十年后,机缘巧合地与一个四处流浪的名叫杰珀德（农索·阿诺齐饰）的独行侠交上了朋友。他们一起踏上了一场穿越美国的非凡冒险,寻找答案——关于格斯的出身,杰珀德的过去,以及家的真正意义。但他们的故事充满了意想不到的盟友和敌人,格斯很快就了解到,森林外郁郁葱葱,危险的世界比他想象的要复杂得多。