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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.杨长帆摇了摇头问道，玻璃试验怎么样了？已经能成型，只是还有杂质。2胡宗宪皱眉道：此人着实毒辣。　　7. Hail Britpop!Junho是一个即将死去的吸血鬼。为了生存，他需要喝纯净的血液，从而成为一个人。有一天，在搜索www的时候。cc为这纯正的血液，他遇见了敏贤。但是另一个名叫海洙的吸血鬼，知道小君的创伤，导致了民铉和小君浩的争吵。作为一个人过着正常的生活，保护民贤，俊浩将不得不面对什么？Delivery, or distribution, includes the parent View passing events to the child View (event distribution process) and the child View passing events to the parent View (event consumption process).