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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.CBS All Access在竞投下直接预订《吸血鬼日记 The Vampire Diaries》主创所Kevin Williamson开发及执笔的剧集《黑色童话 Tell Me a Story》，这部由同名西班牙剧改编的剧集把各种名童话重新改编，然后转化成黑暗﹑扭曲的心理惊悚剧，现定于美国时间万圣节（10月31日）上线。2018-03-02 10:28:21Log in to the system in Safe Mode, The desktop you see is very different from what you usually see. Just like the mode on a Windows 98 system when the system is just installed and no drivers are installed, This is the case, When Windows is running in safe mode, The system will only load the most basic services and drivers that can start the system, so the operating system will run with the least number of drivers and services, and use a common graphics card driver to work at a resolution of 640 × 480. At the same time, it can only support keyboard, mouse, display, local hard disk and turn on the default system services. In safe mode, Windows does not load drivers for audio devices and other unnecessary peripherals, and Windows ignores all programs that run automatically with the system startup.　10集衍生剧里Sophie（Hilary Duff饰）向儿子讲述自己是如何认识另一半，就像母剧里Ted Mosby所做的事。《老妈老爸的浪漫史》背景设置在21年，除了描述女主的寻爱故事外，主角及朋友们亦会探索自己的生活，共同于这个被约会软件主导的时代找寻爱情。Next, I began to learn JDK & JAVA from October to improve my knowledge. Design Pattern is a summary of the experience of predecessors in code development and a series of routines to solve specific problems. It is not a syntax regulation, but a set of solutions to improve code reusability, maintainability, readability, robustness and security.天海博物馆仓库管理员大刚憨厚老实，相貌平平，一直暗恋同馆清纯大方，楚楚动人的大美女、博物馆研究员李冰荷。尽管有李冰荷的孪生弟弟李宇凡作为坚强后盾，大刚事先准备好的五花八门表白方式仍然一个也没用上，反而被中途杀出的一个不速之客、古董商人韩正平抢占了先机。但这个多金而又帅气的贵公子的真实身份竟是专偷古董的大盗，他接近冰荷的目的是为了盗取珍贵的唐朝文物唐俑！宇凡和冰荷在抢夺唐俑的过程中遭遇车祸，均昏迷过去。宇凡在睡梦中看到武则天要被太宗李世民治罪的惊险一幕，惊醒之后又见到姐姐虽未清醒但却有了明显的感知体征。在遍查书籍并询问医生后，宇凡决定再次潜入梦境，不断编织故事，唤醒姐姐，于是一场血雨腥风、步步惊心的宫闱之旅悄然展开。