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There are eleven behavioral patterns (13-23): policy pattern, template method pattern, observer pattern, iterative sub-pattern, responsibility chain pattern, command pattern, memo pattern, state pattern, visitor pattern, intermediary pattern and interpreter pattern.看到这里，沈飞也知道了所谓的天书就是天启写的书。故事发生在 1984 年的印第安纳州霍金斯镇，正值炎夏，学校放假了，镇上新开了一家购物中心，霍金斯小组成员也即将成年。情窦初开的同时，也使小组成员的动态变得更加复杂，他们必须找出一起长大的方法。与此同时，危险迫在眉睫。当小镇受到新旧敌人的威胁时，小十一和她的朋友们意识到，邪恶永远不会结束，它会一直存在。现在，他们必须团结一致才能活下来，并牢记友谊的力量永远比恐惧更强大。这次献城投降似乎做的有些草率，但是彭越并不后果，因为结果对自己似乎是有利的。我们为什么要这麼做……？ 哈尔希洛回过神来，才发现自己身处在黑暗当中，他完全不知道自己人在何处，也不明白这个地方是哪里。 他的身边有一群和他一样失去记忆，只记得自己名字的男女；而离开了地底後，等待著众人的是一个「宛如游戏」的世界。为求生存，哈尔希洛与自己有著相同境遇的夥伴们组成队伍、学习技能，以义勇兵见习者的身分踏入了这个世界--「格林姆迦尔」。没有人知道未来会遇见什麼……这一切，就是从灰烬之中所诞生的冒险谭。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.范依兰续道：但他的本事却是货真价实，十几岁的少年便能统领一群穷凶极恶的盗匪，便看得出此人绝对不简单。