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　　2. Ensure the normal operation of iTunes;富家子高原与大学生李锦文的恋情受到高父极力阻止，因高父知道李母曾开酒馆，认为双方家世悬殊，不能婚配。高原与锦文不顾一切，私奔到乡间结婚，二人勤劳工作，高原且半工读完成大学课程，但好景不常，高原患上脑瘤，变成失明，锦文多方奔走筹钱给他动手术。在浩瀚无垠，神秘莫测的宇宙中，有一支拥有强大力量的精英团体，几个世纪以来，他们一直是正义与和平的坚强守卫者，被称作绿灯军团。每一个团员都曾立下誓言，誓死维护星系间的和谐与秩序。每一个绿灯团员都佩戴着一只能量戒指，藉此拥有创造心智想象所能涉及的一切物质的非凡能力。故事发生在六十年代初期，一穷二白的青年德克（友塔纳·布格朗 Yuttana Puangklang 饰）邂逅了美丽的女子曼妮（婉娜拉·宋提查 Wannarot Sonthichai 饰），然而曼妮却并没有将自己真正的名字告诉德克，而是借用了孪生姐姐文西的名字。这段注定没有结果的感情以曼妮的不辞而别告终。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.2.1 PCB Dimension Requirements