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B. Short track speed skatingIn TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).Pike 2.3The attack uses the method of sending a large number of domain name resolution requests to the attacked server, Usually the domain name requested to be resolved is randomly generated or does not exist on the network. When the attacked DNS server receives the domain name resolution request, it will first look for whether there is a corresponding cache on the server. If it cannot be found and the domain name cannot be directly resolved by the server, the DNS server will recursively query the domain name information from its upper DNS server. The process of domain name resolution brings a great load to the server. If the number of domain name resolution requests exceeds a certain number per second, the DNS server will time out to resolve domain names.一对恋人在茫茫的岁月里，追逐着一段段纠缠不休，情定今生的爱情故事。为白彤治疗的期间，雨辰对活泼可爱的白彤心生爱怜。 　　凯文因不满母亲的所做所为，决意离家来到上海，结识了富家千金阿慧，阿慧芳心暗动，但凯文无法忘情白彤，四处寻找，屡次几乎重逢，却又阴差阳昏地失之交臂，真是造物弄人。 　　雨辰虽对白彤一往情深，无奈白彤仍牵挂凯文。 　　凯文的同窗好友吴良术自在温家见到秀月后，被其美色所迷。来到上海，吴良术屡次碰壁，前途茫茫，沦落为一贵妇的小白脸。他为飞黄腾达，不择手段。后秀月被其所骗，并有身孕。随即吴良术又盯上了银行家之女阿慧，阿慧因情感失意，决定下嫁于他，可是有秀月这块绊脚石，吴良术为达目的，将秀月推下了黄浦江…… 　　婚礼上，吴良术得意洋洋地掀起新娘的头盖，哪知…… 　　秀月的命运如何？ 　　吴良术的结局怎样？ 　　凯文与白彤最终能否走回到一起……何须叹息？韩信轻声说道。/hungry