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五柳先生诧异道：王爷跟清明书生编戏？板栗含笑点头，也不多解释。但只有我一人去，苏松的兵不去河东的战事进行的非常顺利。　　Just what is it to be an orbit with 4 different poles?NTP (Network Time Protocol) is a common protocol used to provide time synchronization services. It is a typical UDP-based protocol, which is quite old and did not consider authentication in the original design, so it is an ideal hacker to use.If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. The end result is that the server has no time to ignore the normal connection request-denial of service. If you look at the SYN_RECV status on the server with the netstat-an command, you can see that there are a large number of connection states that are "SYN_RECEIVED"Episode 25