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Large traffic attacks saturate the bandwidth and infrastructure of the network through massive traffic and consume them completely, thus realizing the purpose of flooding the network. Once the traffic exceeds the capacity of the network or the ability of the network to connect to other parts of the Internet, the network will not be accessible, as shown in the above figure. Examples of heavy traffic attacks include ICMP, fragmentation, and UDP floods.Activity monitor is a device that can detect and interfere with traffic to the server. Like firewalls, it is not a necessary device in network routing. A typical monitor, like the ACK disguised firewall/proxy in 7, has an additional capability, that is, if it finds that the SYN packet originates from an attacker source address it knows, it will immediately send the disguised RST packet to the server. Activity monitors are practical because they are cheap and easy to deploy (compared with schemes based on firewalls and input source filtering), and can still protect the entire server network without requiring each server operating system to implement a terminal-based solution.新加坡小学实行分班制，EM1是学习成绩好的班，EM2是中等成绩的，EM3则是成绩不好的班级。国斌、文福、Terry是EM3的学生，被其他学生瞧不起，老师、亲戚和朋友认定他们是 “笨小孩”。他们因此不喜欢学校。 Terry生活优越，喜爱依赖别人，做事没主见，逃避承担责任。国斌喜爱画画，母亲却认为这会影响学习成绩。文福需要照顾弟弟和帮母亲开档。也不见得能够在这么短的时间内做出这样详尽的战略决策来。Initiating a resolution request to a DNS server for a random, non-existent domain name; In this way, the DNS server needs to carry out frequent string matching. Since the corresponding results cannot be found locally, the server must use recursive queries to submit resolution requests to the upper domain name server, causing a chain reaction.讲述了25年前电影院一场大火的记忆虚幻又真实，将现今看似毫无关联的人和事紧紧联系在一起。原班人马在第二年的续作，日本人气漫画《金田一少年事件簿》真人版。