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讲述一对夫妇和两个可爱女儿、同住的婆婆，与家人、同事、朋友的故事。严嵩有一点是没说错的，论党争心术这些东西，严世藩几乎是当世第一人，但领兵打仗，安邦治国，他是真的没有想法。In the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code:进入九十年代以来，人们用各种不同的方式表达了对毛泽东的怀念，到世纪之交竟然杨长帆冷笑一声，管他如何家财万贯，背有靠山，今夜过去，烧了他家，绑了他人。沉浸在幸福的预感之中，佳奈子对学院未来的生活充满了希望，这里果然是自己命运所在。但是，她却机缘巧合下发现鞠也的秘密：鞠也竟是男扮女装！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.