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Facing TCP's three-way handshake protocol, how should attackers launch attacks? The attacker first intentionally initiated a handshake packet. After receiving it, the server puts it into the waiting queue and returns an acknowledgement. Secondly, the attacker will no longer send the third acknowledgement packet, thus the server will make multiple retransmissions (the Linux system configures the number of retransmissions through tcp_synack_retries), consuming a lot of extra overhead, and the waiting queue will be occupied, even the waiting queue will be full, eventually causing the server to be unable to receive the client's request. This is the attack.在衍生剧《私人诊所 Private Practice》剧终四年后，ABC于上年五月时预订另一部《实习医生格蕾 Grey's Anatomy》衍生剧《19号消防局 Station 19》，现定於美国时间3月22日首播。由Shondaland制片﹑《实习医生格蕾》制作人 Stacy McKee执笔的衍生剧背景在西雅图消防局，讲述一群英勇的消防员，上至队长下至菜鸟的他们冒着自己生命安全去拯救民众。Jaina Lee Ortiz饰演衍生剧女主角Andy Herrera，而《实习医生格蕾》的角色Ben Warren医生（Jason George饰）会先继续在母剧出场，然后转往衍生剧里。Grey Damon饰演消防副队Jack Gibson，Okieriete Onaodowan﹑Danielle Savre﹑Barrett Doss及Jay Hayden依次序饰演消防员Dean Miller﹑Maya Bishop﹑Victoria Hughes及Travis Montgomery。Miguel Sandoval饰演消防队长Pruitt Herrera， Alberto Frezza饰演警官Ryan Tanner。北方……大江以北，至少也是淮水以北将都会是汉国的领土。本作品以迎来“乒乓球战国时代”的东京为舞台，是一部描写高中生们展开激烈乒乓球战斗、友情的体育青春剧。尤其是苏岸，他现在可以说是尹旭的卫队长，一千近卫军指挥权在手。