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For example, the above Liezi, Xiao Ming and Xiao Hong do not need to visit Taobao every day to see if the shoes have arrived. At the right time, when the publisher (seller) arrives, they will notify the subscriber (Xiao Hong, Xiao Ming and others).When the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.她终于失声痛哭，一边喊道：我不行。BBC宣布续订第11季。In the above story, it can be seen that it is a typical publishing and subscribing mode. The seller belongs to the publisher, and Xiao Hong and Xiao Ming belong to the subscriber. Subscribe to the store. As the publisher, the seller will notify Xiao Ming and Xiao Hong in turn when the shoes arrive, and use Wang Wang and other tools to publish news to them in turn.他现在总算是明白了，尹旭是个不见兔子不撒鹰的主，现在总算是有定论了。syfy幻想剧集《魔法师》宣布续订第5季。