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Observer mode:2. Second handshake: The server receives SYN message segment. When the server receives the SYN message segment from the client, it needs to confirm the SYN message segment and set the Acknowledge Number to x+1 (Sequence Number+1); At the same time, I also need to send SYN request information, setting SYN position to 1 and Sequence Number to y; The server side puts all the above information into a message segment (i.e. SYN + ACK message segment) and sends it to the client side. At this time, the server enters the SYN_RECV state.突然间，肖亮想到一个人。Successful take-off, press G to retract the landing gear, and press the key to raise the height (this height will hit the mountain). What mountain is this?1. "Mast Light" is a white light designated to be placed above the centerline of the head and tail of the ship. It displays uninterrupted light in a horizontal arc of 225 degrees. Its device is to display the light from the front of the ship to 22.5 degrees behind each side.何永强向后退了半步，那在下先告辞了？嗯。　　雾山和三日月在一堆失了时效的案件中，揪出了一些谜点，与那些犯人周旋，然后展开了别样的推理故事。伴随着各种冷笑话，最脱力系的推理故事就此开始。