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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.红椒双手抱住签筒哐啷使劲摇。A1.3 Disease IdentificationIn the Song Dynasty, Kang Sugong and Chen Yaozi were good at archery. Chinese Odyssey felt good about himself with archery. One day he was shooting arrows on his own field. An old man selling oil put down his burden and stood by to watch him shoot arrows. He did not leave for a long time. The old man saw that nine times out of ten he hit the bull's-eye straight and only nodded slightly.Imitation of role models: role models can be real-life mentors or online mentors.　　武梅抽丝剥茧耐心侦察，终于迫使“钓鱼