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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.在繁杂的商业关系里，各种各样的商业行为都依赖公关去包装、推广，他们虽见尽富贵荣华，当中的金钱与权力却从来不属于他们。终日面对纸醉金迷的氛围，谁不会心动?谁又甘心毕生屈膝侍人?家里后园子的枣树还小，今年才结果，也没多少，怕是早就摘完了。该剧精选京剧、评剧、越剧、黄梅戏、晋剧、豫剧等观众耳熟能详的戏剧精品，将每个戏剧作品拍成2至4集的电视剧，拟 拍摄中国“十大古典悲剧”、“十大古典喜剧”、“十大古典公案剧”三大系列一百集。首批39集名剧包括：王老虎抢亲（2集 ）、西厢记 （ 3集）、窦娥冤（ 3集 ）、十五贯（5集 ）、拜月亭（3集）、牡丹亭（ 4集）、桃花扇（4 集）、胭脂 （2集 ）、团圆之后（2集 ）、琵琶记 （ 2集）、碧玉簪（ 3集）、玉 堂春（ 3集）、四进士（3集）。拍摄这样一部作品，对于弘扬中国传统 文化，发掘和拯救珍贵文化遗产，具有极深远的意义。对喜爱传 统戏曲的观众来说，有利于温故知新；对于没看过传统戏剧的新观众，是他们了解传统戏曲，了解中华文化的极好机会。Responsibility chain mode:最爱小米的翌在她的生日哪天因车祸死了。翌曾经说过，就算有一天他离开了她也会找个天使继续来爱她，可是翌走了，天使在那里？