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For this reason, we can encapsulate a global publish-subscribe mode object. The following code:Facing TCP's three-way handshake protocol, how should attackers launch attacks? The attacker first intentionally initiated a handshake packet. After receiving it, the server puts it into the waiting queue and returns an acknowledgement. Secondly, the attacker will no longer send the third acknowledgement packet, thus the server will make multiple retransmissions (the Linux system configures the number of retransmissions through tcp_synack_retries), consuming a lot of extra overhead, and the waiting queue will be occupied, even the waiting queue will be full, eventually causing the server to be unable to receive the client's request. This is the attack.吴凌珑琢磨着火候刚好，这才说道：不过长帆也谨慎，有一点他说的对，钱多了，在海舍那边不安全。一名童养媳长大后成了一位神秘寡妇，掌管整个家庭的她内心藏有一个痛苦的过去，而她村里的男子遭受着死于超自然力量的厄运。娘也没说不以夫为天。“我有个请求，希望我能回到太空What kind of hardships does a young woman with disabilities who has only a high school culture and lives in the countryside have to pay during her writing? I think, don't make the problem of "standing up and talking without pain". From the heart, in addition to admiration, or admire.